Problems screen sharing w/ MacBook

I'm new to networking, so I hope someone can lead me in the right direction. I have a new iMac Intel running Leopard. I also have a MacBook2,1 running Tiger. They both are on my Airport Extreme network.
I can screen share from my iMac to my MacBook, but not the other way around. When I try to access my iMac from my MacBook I get the dreaded beachball for about a minute then it won't connect. I have "file sharing" and "screen sharing" enabled in my system prefs on my iMac.
Am I missing something here?

I've got it answered, you just can't screen share from Tiger to Leopard. You can do it the other way though. Check out this thread:
http://discussions.apple.com/message.jspa?messageID=5975019#5975019

Similar Messages

Screen Sharing issues MacBook Pro Retina

Loving my brand spanking new MacBook Pro Retina 15" running Mavericks. Display set to 1900x1200. The only thing it doesn't do, is play full screen YouTube video from my Mac Mini (2011), as soon as I put that in full screen mode on the Mini. Mouse and keyboard no longer respond, the only option is to wait untill it is finished or use the controls on the Mini. My screen sharing is set to all adaptive settings.
What I have done to do checks:
remote control MacBook Pro Retina from Mini (same settings for screen sharing, resolution on Mini is 1080p) and play full screen HD YouTube video: no issues, scaling works flawlessly;
check all network settings on both computer - no issues, both connecting full speed (400mpbs), wireless file exchange proves this;
reinstalled Mavericks both on the macbook and Mini;
removed all plists and preferences on both machines;
saved files to external HD, emptied harddrives, and clean installed Mavericks on both(!) computers
Installed all updates to december 12th 2013 (including the december screen sharing update).
All to no avail. So I figured to draw some new variables in the equasion and do some control testing.
I have done a test from an older MacBook Pro 17" (2010), display set to 1900x1200 as well. No problem at all controlling either computer. Scaling works flawlessly. Dito from an older iMac 21" running Mountain Lion. Like a charm, correctly scaling to meet the screen and network confitions.
So I figured shrinking the size of the application window on the MacBook to about 1/4 of the surface, and guess what: there she flies. Enlarging the application window on the MacBook Pro has a linear effect on the responsiveness of the screen sharing application, trying to view full screen video the Mini.
Verified this by controlling the older MacBook Pro 17" (1920x1200) from the MacBook Pro Retina 15". Confirmed that the above problems persist. Shrinking the screen again smoothens things out.
This quite definite to me, it is the screen sharing application that is not able to handle scaling on the hardware or interact with the software drivers of the Intel Iris Pro/NVidia GeForce GT750M combo. I hope this gets fixed soon!!

Setting Low Res on the apps didn't seem to help, however (as has been mentioned elsewhere) changing the display settings to non-HDPI does fix it, for GoToMeeting at least. (Also it let's you appreciate how nice the retina display is, in case you've already gotten used to it!)
You need an app for that however. SetResX from http://www.sendspace.com/file/mef6sk works well for me. To return to nice Retina/HDPI mode you have to go back to Display Preferences (and the "Show in Menu Bar" option for Display Preferences is sadly AWOL in Retina/Lion so you have to navigate through System Preferences.)

PLEASE HELP, SOMEONE REMOTELY VIEWING/SCREEN SHARING MY MACBOOK?

Hi - I urgently need help from anyone who knows about this issue - I am a very basic macbook user, and don't really know about all the different programmes etc. I believe someone ( the guy who sold me the macbook, who told me he was a mac repair person and programmer) has been hacking into the computer, using the remote access - there is a programmed called SCREEN SHARING but I cannot access it - and a bunch of other files such as odsagent etc - not sure if these indicate he is using the screen sharing/ remote access to my mac.
The reason that I believe he is accessing the mac, is that he downloaded all the files, so would clearly have access to passwords etc, there were loads of his old files, that showed pictures of people saying " target", and old files showing he was studying comuter/ mac programming. The first time I went online all of a sudden the computer froze, and two green lights showed on the num lock key and the shift key I think, the two keys were frozen, and the keyboard basically wouldnt respond, but the activity continued on the screen. This has happened a number of times since then, usually just randomly the keyboard freezes, and if you wait a while it goes back to normal - the mouse works fine, then one day it keep sort of freezing/ getting stuck/ pausing for no reason - the next day its fine again. He put in a load of software, which he has obviously been able to get round the need of liscening numbers, as he did not provide me with them. one day I saw a name "macbook pro" suddenly appear, and that it was tryin to connect/ share or something - this has never happened to me before with my old mac- it was like another computer was connecting/ sharing with my computer without my permission - this was when I was online. This has not happened since.
I am scared he is accessing the computer, because these things that happened, and because there is loads and loads of files and programmes, which sound suspicious, i dont know what they do, and I just have this dogey feeling about this guy, and the fact that there is screen viewing/ remote management files etc which I cant access, but I am not sure if they are being accessed.
PLEASE HELP - I FEEL LIKE MY PRIVACY IS BEING INVADED - I was speaking to my family on Skype and the green lights came on/ it froze, I continued with the conversation, but later I felt like he might have been watching.
If anyone can recommend an expert in the London area, that can check the mac to see there is nothing on there that is being used to remotely control/ screen share my mac, I would be very grateful - its just horrible using your computer, and always being worried someone is invading your privacy, and and downloading your files etc.
Sorry if I sould paranoid, but I have a strong feeling something is not right here.
Many thanks for your help in advance.

Since you don't know much about computers, disconnect your internet (wireless or wired) to prevent future unwanted access. While it is smart to contact Apple Communities, this is a criminal matter and you should consider taking the matter to the police. People like this will not stop with you. You need to list the private data that may be stolen and take action (cancel credit cards, change passwords, bank accounts, phone numbers, whatever you have cause to be worried about). If you can afford it, buy a new hard drive, remove the old one, and install OS X from scratch. Give your old hard drive to the cops. Make sure you turn the Firewall on (click the Apple up on the toolbar top left > System Preferences > Security) and uncheck any "Sharing" options (System Prefernces > Sharing). This event you are experiencing is unfortunate, and rare, but with a pro-active attitude you will come through it fine - and wiser.
EDIT
dgambler is right in that by purchasing a Snow Leopard disk (presuming you don't already have one) and performing a fresh install (it is easy) is a sure way to "take back" the controls of your Mac. You will need to study online tutorials for "wiping the drive" rather than a simple install. But you should let the police look at the hard drive before you do that - they will be able to see exactly what this person did.
usefull information:
http://docs.info.apple.com/article.html?path=mac/10.4/en/mh294.html
http://lowendmac.com/ed/rosen/mac-remote-control.html

Problem Screen Sharing with my grandma.

I am having trouble screen sharing with my grandmother's computer. I have a brand new Mac Book Pro 15-inch, 2.4 GHz Intel Core 2 Duo processor, 2 GB of memory with Mac OS X 10.5.1 . I bought my computer and my grandmother's back in October right after Leopard was released. She has a brand new iMac 20-inch, 2.4 GHz Intel Core 2 Duo processor, 2 GB of memory with Mac OS X Leopard 10.5 .
We have been talking over video/audio chats using AIM for quite some time now with no problems other then an occasional internet problem (audio or video skips for a second or audio/video quality is bad for a few seconds). She is used to Windows so I have had to show/explain the basics of a Mac and every time she has a problem with something I try to help her by walking her through it, but it would be really nice if I could just do it myself through Screen Sharing. We have tried to share her screen but it comes up with and error message every time.
I have looked at the things that people are saying about how to fix your problem with screen sharing and I have tried most of them but they don't seem to be working. Maybe I am just missing something.
Please help me get this to work.

As you say there is nothing Specific in the Info about Fair Usage.
However the things you can not do are not so specific and could be stretched to cover what you want to do.
However it would depend on how actively they searched the data traffic for the things that might be interpreted as P2P file sharing and the from it takes.
As you can Video to some and Not Screen Share to others it sounds more like a NAT issue with (or possibly ports for Sharing Screens at your Grandma's) between you and your Buddy. ANd I think it is unlikely to be your ISP.
The Screen sharing part of iChat does not use the listed A/V or login ports.
It is supposed to use the Apple Remote Desktop ports that it is based on. However I have used Little Snitch which has pointed to many other Ports almost at random.
Try changing the Login port at both your End and your Grandma's
(iChat > Preferences > Accounts > Server settings tab - change the port from 5190 to 443) You can only do this whilst logged out of the AIM servers.
5:25 PM Tuesday; February 12, 2008

IChat Screen Sharing Kills Macbook -- Black Screen & Reboot

So this is kind of new. Yesterday I was screen sharing just fine, that's sharing my screen to another person.
Today I get an invite from a friend, asking for my screen, and I accept. I hear audio from his end for about a second then my macbook crashes and begins the boot sequence by itself.
I thought it was a small bug of some sort, I invited him to see my screen after I was all booted up.
Same thing. The screen went to black with strange color bars on it. I was going to get a picture but it started booting by itself again after 10 seconds or so.
Uhh.. any ideas?

Hi,
If there are two Mac Users on the computer they should be able to make the same changes to any iChat setting.
There are exceptions but these involve the Second account being subject to Parental Controls.
This, if the iChat Limit is set, stops a Person Adding Buddies without approval - depending on settings- and not using some Buddy lists (Bonjour in all versions and Jabber as well in 10.5.x) and possibly excluding some Buddies.
I must admit to have not tried Screen Sharing in an Mac User account with Parental Controls ON.
There is another Thread currently where the users is finding that Blue Tooth just being On is stopping Screen Sharing.
I have tested this and I can Screen Share with Blue Tooth on.
They are using a Apple Track pad that I don't have to compare with though.
Hope that gives you some clues.
11:18 PM Saturday; February 12, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

IChat screen sharing- shared screen is green/grey pixelated

Have a strange problem trying to share the screen of my parent's MacBook Pro: request accepted, but I can't see their screen. I get a first glimpse and it works, but then it degrades to grey/green pixelated, in general, unreadable.
Both computers are running Lion, all updates installed. Any ideas on how to fix this? Have toggled screen sharing in Settings, but am stumped as to why this happens. They also have an iMac, and have no problem screen sharing. Only difference is that the iMac is connected to internet by ethernet, the MacBook Pro via wifi.

Hi,
As a Starting point go to iChat Menu > Preferences > Video Section and change the Bandwidth Drop down to 500kbps
Do this at both ends.
10:36 PM Friday; October 28, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb( 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

Screen sharing between two computers

I have a G5 in my studio and a MacBook Pro in my house which are connected by Wi-Fi. Both computers have sharing switched on and I can open folders easily between computers. Now, I can screen share from my G5 to control my laptop screen but when it comes to the other way round, my MacBook requests a name and password to share the G5's screen. I have never really understood that when I'm asked for a user password to access a remote computer, does it mean the computer's password that I am currently on, or the one I am trying to gain access to (which seems the logical choice) so I have tried the following from my laptop:
The G5's computer name and it's user administrator's password
My G5's administrator user folder name (which is the same as the MacBook Pro's) and same password,
The administrator's user MacBook Pro's password with the G5's computer name
Try either password plus the hard drive name of the G5 (running out of ideas at this point)...
I know it's not the end of the world, but can anyone suggest a way out of this? All suggestions welcome.
Michael

I'm having the same problem screen sharing to a Lion 10.7.3 machine, I get this message.
However, it works just like it used to when I screen share from a 10.7.3 machine to another Mac running 10.6.8.
Any thoughts?
Thanks!

No screen sharing between Leopard and Snow Leopard

A buddy just bought a new 27 inch iMac after the screen on his old iMac (running Leopard) died. We had no problems screen sharing when he was using the old Mac, but with the new iMac running Snow Leopard, he can screen share with me but I can't screen share with him....at least, iChat says I am sharing my screen with him, but he can't see anything. It must be an issue with Snow Leopard, since when he opened iChat on his MacBook running 10.5, he was immediately able to view my screen.
Any thoughts, anyone? Cheers!!!

Hi,
A Bit for other reading this thread.
To change the Login port for any AIM based name you have to obviously Log out first and then Change the port (SSL might need to be selected first) and then Press Enter to "Set" the port.
This use of the Enter key is the bit that is different to earlier versions of iChat.
For Gary,
Which Thomson-Alcatel device do you have ?
Thomson-Alcatel Speedtouches used to work well when the firmware that ran them was at Version 4.2.5 or less.
At least at this level you could access the device via Terminal using Telnet and then access the Command Line Interface (CLI) and "Unbind" SIP from port 5060
Later versions of their Firmware did not allow for a full Unbind of SIP and Video and Audio chats could only be partially successful (about 15 buddies out a list of 50
Of course using UPnP to open ports for iChat 4 helps with the Screen Sharing as the process is an Screen Share with an Audio Chat along side and both have to work/connect.
I am surprised to hear that in iChat 5 that Screen Sharing is not working when Video and Audio chats are.
For this reason I would ask how the ports have been opened in the Thomson device ?
After that I would keen to know if the Thomson Device or the Time Capsule is doing DHCP to the LAN ?
(Share an IP on the Time capsule is to Enable DHCP)
I am not sure how AT&T expect anyone to use their site to gain help or see what they currently offer when you have to type in a phone number or area (ZIP code).
I did enter the example number and got to this set of pages http://www.att.com/esupport/main.jsp?cv=801#
I see no reference to any Thomson-Alcatel device.
8:15 PM Monday; February 15, 2010
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

Firewall vs screen sharing

Hi,
since a few days, I'm using Lion on my iMac 24" (2008) and my MacBook Air (2010).
But now, I've some problems: Screen sharing from MBA to the iMac doesn't work if the firewall if the iMac is active.
Screen sharing from iMac to MBA: no problems. Strange?!
My router is a Time Capsule 3rd Generation.
Any idea how to solve this?
Thanks
Michael

Solved:
Iv've had to reboot my iMac and to configure the settings once again.
Then, the missing programms have been added to the firewall!

Screen Sharing via iCloud on Lion Freezes at Login Screen

After updating to OSX Lion 10.7.3, screen sharing between two computers via the Internet allows me to connect to the remote computer and see the remote user's login screen, but as soon as I click on a user to login, the screen share image freezes before I can enter the user password.
Using iCloud Back to My Mac because all machines have the same Apple ID & password. Exact same setup worked before the 10.7.3 upgrade, but it could be coincidence.
Details:
Can see the remote computers in my finder,
Can click on them and connect successfully using either the Apple ID or the name and password a user that is allowed under Sharing -> Screen Sharing,
When clicking on "Screen Share," the computers connect and I'm prompted to either "Ask to Share the Display" or "Connect to Virtual Display"Since there really isn't anyone using the computer, I select "Connect to Virtual Display"
After clicking "Connect to Virtual Display" the Screen Sharing window shows the remote computer's login screen, whcih shows the user names, their icons and "Sleep" "Restart" or "Shut Down" on the bottom of the screen. One user has an orange circle with a white checkmark next to it.
Previously, I could click a user's name or icon, enter the password and control the remote Mac. Now, not amount of clicking works.
Have tried disconnecting and reconnecting as different users or using Apple ID without changes in the perofmance. Have restarted both machines.
Any help?

I'm having the same problem screen sharing to a Lion 10.7.3 machine, I get this message.
However, it works just like it used to when I screen share from a 10.7.3 machine to another Mac running 10.6.8.
Any thoughts?
Thanks!

Screen Sharing/network problem seems confined to 1 volume. What's the fix?

I am having a networking problem on one of the volumes of my multi-volumed, three-Mac local area network, and I need a networking guru to identify the specific software file(s), application(s), or system configuration that is the cause of the problem. I have already spent several hours checking and re-checking the various hardware and system preference settings involved, and I have narrowed the problem down to a software corruption issue and/or system configuration issue on one volume.
I now need someone to identify specifically what the nature of the problem is, and how to eliminate it. I am not looking for a sledgehammer solution that says I should re-install all of the Mac OS X software on the problem volume. That may be held in reserve as a last resort. I'm looking for a more elegant approach, one that points out the specific corrupt files to remove without disturbing everything else.
Here's some background to set the context. I have a MacBook Pro laptop; a PowerMac iMac G5; and a PowerMac G4 hooked up in a network. All are running Leopard 10.5.8. All have file sharing and screen sharing enabled. Besides being able to connect to each other using registered users, my goal here is for each of the Macs to be able to share the screen of the others upon my demand. Since each of the 3 Macs can theoretically share the screens of the other 2, that makes a total of six possible connections. Five succeed; one does not. That's the problem. I am trying to determine why the iMac G5 cannot share the screen of the MacBook Pro.
The iMac G5 has no problem sharing the screen of the PowerMac G4. That connection is fast and immediate. But, every time that I hit the Share Screen button on the iMac G5 to try to connect to the MacBook Pro, I get a window with the blue barber pole spinning for two or three minutes as it is allegedly "Connecting to Mac Book Pro," followed by a window with a headline telling me that "Connection Failed to MacBook Pro." The text within that window goes on to say: "Please make sure that Screen Sharing (in the Sharing section of System Preferences) is enabled on the computer to which you are attempting to connect. Also make sure that your network connection is working properly."
Well, as I indicated, the PowerMac G4 has no problem sharing the screen of the MacBook Pro, so the Screen Sharing settings on the laptop are correct; and the iMac G5 can share the screen of the PowerMac G4, so its network connection is working properly in that regard. It is only in regards to sharing the screen of the MacBook Pro that the iMac G5 is not working properly.
The reason why I say that the issue must be unique to the one volume in question, let's call it "iMacG5 Music," is that another Leopard volume on the same computer has no problem whatsoever in sharing the screen of the MacBook Pro. Whenever I boot up in that volume, let's call it "iMacG5 JMB," it makes a network connection with a registered user name immediately, and it is able to share the screen of the MacBook Pro within a second of my issuing the command. In sharp contrast to the success of the iMacG5 JMB volume, the iMacG5 Music is unacceptably slow (several minutes slow!) in making a network connection with the MacBook Pro, and it always fails to share the screen of the MacBook Pro, preferring instead to take about three minutes to attempt the connection, before announcing its failure.
Since the iMacG5 Music volume makes an immediate network connection to the PowerMac G4, as well as sharing the screen of the PowerMac G4 the moment I ask it to, I have concluded that the hardware of the iMac G5 is just fine. The problem seems confined to the system software and/or associated networking files that are unique to the iMacG5 Music volume. I just don't know what those files could be, or where the problem lies, so I've issued this call for help.
Let me add one more little twist to this puzzle which baffles me even more. I use external LaCie Firewire drives as clone backups of my Macs. As part of my trouble-shooting process, I booted up from the cloned versions of the iMacG5 JMB volume and the iMacG5 Music volume. What I learned surprised me!
The iMacG5 JMB clone worked just fine in making a fast network connection to the MacBook Pro, as well as sharing the screen of the MacBook Pro. I expected that. What I did not expect was that the iMacG5 Music clone was also able to make a fast network to the MacBook Pro, as well as share its screen!
Yes, that's right. It's weird! Screen sharing works OK when I start-up from the clone of the iMacG5 Music volume, but it does not succeed when I boot up on the source itself! I was surprised to find that out, but I'm glad I did.
(Over the past few days since I executed the last clone, I did use Drive Genius to de-frag the source volume, and maybe that has contributed to the problem I am now encountering. But it's hard to say, since nothing else seems to be amiss.)
One solution, I suppose, would be to sync the clone back to the source. But, before I do that, I'm just wondering if anyone has a clue as to the nature of this problem on the source volume and what I might do to remedy it—short of re-installing the system software or restoring from the clone. Anyone have any insight to this problem?

CORRECTION #2:
Ignore the previous "CORRECTION" post.
Oops, excuse me, I wrote that sentence correctly the first time.
I was trying to point out that the ability of the iMac G5 computer to connect quickly and effectively to the PowerMac G4 when booted up into the iMacG5 Music volume was an indication (to me, anyway) that there is nothing wrong with the computer's hardware, nor its network connection ability, but that the problem lay somewhere in the files/settings used to connect to the MacBook Pro, which it cannot accomplish.
This is what happens when I get engrossed in one of these technical morasses and it ***** me into its vortex all through the night... time for bed.

Problem using file sharing and screen sharing in Leopard

I have Mac OS 10.5 Leopard installed on 4 computers in a Home Network and have a problem with sharing files and using screen sharing. Here is my setup.
MacBook Pro with my logon ID
MacBook Pro with my fiancee's logon ID
Mac Mini with both of our logon ID's
Mac Pro with both of our logon ID's
The problem I have is I am able to access the Mac Mini computer where we have an external Hard Drive connected for data. She is also able to access it. The only problem is we have it set up to only share this external USB drive. Yet for both of us it shares the external drive along with the internal Macintosh HD. Fortunately this is not a very big deal but since I'm not sharing all those drives why is it doing this?
Also, I am able to connect from the Mac Mini for example to my MBP and vice versa for screen sharing along with file sharing. Yet if she tries to connect to the Mac Pro from her MBP and vice versa it won't. It simply times out and will never connect for screen sharing or file sharing but yet the Finder shows the Mac Pro. We have a 2nd hard drive in the Mac Pro which is the one set up for file sharing. I am also unable to connect to the Mac Pro's HD. Everything appears to be set up correctly. For my MBP on the Finder it shows the Mac Pro but once again I am unable to connect to it for screen sharing or file sharing.
Also, not sure if it's related but even for her MBP she is unable to connect to it from any other computer in our network although it's set up for file sharing and screen sharing so I'm not sure if it's related to her logon ID. Then again as mentioned above neither of us can connect to the Mac Pro.
I tried to make the above sound as simple as possible. I am relatively new to networking and of course Leopard but even on the Mac Pro all settings sound the same as on the Mac Mini where we can both connect to. The only big difference is on the Mini we are connect to a USB external drive, on the Mac Pro an internal drive. Is there something I could have overlooked or are there known issues with Leopard's sharing features?
We both have .mac but since we are using this on an internal network (some wi-fi, some wired, all through an Airport Base Station Extreme) I would think this has nothing to do with Back to my Mac.
I appreciate any help with the above.

FaceTime doesn't do any of that, so I'll assume you mean Messages.
From the Messages menu bar, select
Video ▹ Connection Doctor
In the window that opens, select
Show: Capabilities
There should be a checkmark on the line with the words "1-on-1 video chat." Select
Show: Network Status
You should have two green dots.
Make sure that you and the other party meet the applicable requirements shown in these support articles:
Share your screen
Requirements for audio chats, video chats, and screen sharing
See also:
Fix video chat issues

IChat screen sharing and video not working on MacBook but works on Mac pro

I have a MacBook and MacBook pro. Both have the lion os 10.7.2. I can use iChat on the MacBook pro for screen sharing, video chat, and text chatting, with others remote to me. However, I can only do texting with the MacBook. I can do screen sharing via Finder between my MacBook and MacBook pro. I can do FaceTime between both systems. I can also do FaceTime between the MacBook and anyone remotely.
I also tried installing teamviewer on the MacBook, and on a remote MacBook..... And I get the same results where I cannot share the screen, from the one that has not been working.
I have checked the settings under system preference and made sure screen sharing was enabled. I have checked under iChat under video to make sure screen sharing was checked.
The macbook that is having this problem is configured for AIM for iChat
I have run out of ideas. Any suggestions on what I might try?
Thanks

Ok,
I will list the ports in greater detail and point out when iChat uses them.
AIM Login and 1-1 Text Chatting
iChat version 1 through 5 will Log in to the AIM server on port 5190 (TCP Protocol) by default.
Since iChat 2 we have been posting here that the AIM servers allow a Login on almost any port and have been suggesting port 443.
This is used by both Web Browsers for secure Login to some sites and by the Mail app with some mail servers.
It is also below port 1024 (most domestic routers have the ports above this figure closed) In some campus situations using port 443 will normally allow at least Login and Text chatting.
iChat 6 uses port 443 by default.
File Transfers (AIM)
When doing File Transfers with AIM Buddies iChat will move to using Port 5190 on the UDP Protocol.
This cannot be changed. (This invokes the little Message about Starting Direct IM in an open Chat)
It also uses this port for Pics-in-chats, dropping Files on a Buddy's name with out a Chat or sending other files that are not pics.
In the case of Port Forwarding some devices don't like port 5190 being forwarded "twice" which is another reason for moving the login and Text chat port.
Jabber Logins
No matter what Jabber server you use ichat will use one of two ports (5222 and 5223)
Which one it uses is dependent on whether it needs and is using an SSL Login or not.
SSL Logins use port 5223 and NON SSL one use 5222 (ticking or Unticking the SSL box on a Jabber account will automatically change the port).
Google Talk is the exception in that it allow a Login on port 443 as well.
The First Apple Doc I linked you to says iChat uses port 5220 in Jabber.
I run Little Snitch and have never seen any version of iChat use this port at any time.
Bonjour
Any Mac to Mac Connection or Mac to any Bonjour able peripheral will be on port 5353.
This is normally opened (Preset) in the Mac Firewall for the Finder/System side of Sharing.
iChat needs and uses two other ports (5297 UDP and 5298 on both TCP and UDP)
As they an LAN Side connections the router would normally pass them.
At iChat 3 there were issues with the Mac Firewall (it included UDP set up and the preset in the firewall only listed them and TCP so we had people add all the iChat ports (you had to manually enter them in Tiger)
A/V Chats
No matter which Buddy List you start from iChat will do A/V chats the same way.
The Visible Invite you or your Buddy sends is on port 5678 (UDP)
In iChat 3 and earlier iChat then moves to port 5060 to send the SIP Connection Process invite behind the scenes (SIP = Session Initiation Protocol)
Port 5060 is one of 4 ports internationally agreed for SIP (How VoIP phones connect) (5060-5063).
Although ISPs were not supposed to block Through traffic many started blocking End users and then Charging them to open these ports (Many ISP were telecom companies that were losing long distant Telephone calls monies).
The SIP process then in iChat 3 contacts a server run by Apple for this purpose (Snatmap.mac.com to give it it's full name).
This acts like a old fashioned telephone operator connecting the call.
SIP is a text based process.
Your end "Calls" the operator.
The Operator "Calls" Buddy.
Buddy Accepts
iChat then negotiates the ports to be used.
In iChat 2 and 3 it uses 4 ports (vid in Vid out, Audio In and Audio Out) from "the group of 20" starting at the bottom (16384 to 16387 normally)
Three and 4 way chats uses more ports (which is why 20 are set aside)
In iChat 4 Apple realised the issue with the 5060 port and changed the way iChat worked
Since then it has Sent the invite on Port 5678 but then moved to port 16402 (it starts at the top of a smaller group of 20)
All Video and Audio traffic is also now on one port (so no need for 20 ports and iChat now lists 10).
NOTES so Far.
File Sharing during a Chat converts the Chat to Direct IM for AIM Logins
This is Peer-to-Peer in AIM
A/V Chats are Peer-To-Peer and you can actually log out of the Buddy list and continue the chat. (The exception is using iChat 6's AIM Video relay option)
Screen Sharing
Screen Sharing is an Audio Chat with a VNC connection along side.
Both bits have to wok to avoid the Pop-up to send to Apple and the Log that contains.
The Audio part is on port 16402 and the VNC part is random. (So random it is different every time you do it)
The reason it is classed as an Audio Chat+ is so the AppleScript for Auto Accept can filter out Screen Sharing connection and Not Auto Accept them.
This does have a knock on effect as far as your Router is concerned as already mentioned earlier.
You cannot Forward or Trigger the random Port so you have to use UPnP in your router to open the ports.
NOTES
Jabber File sharing may possibly be on port 1080 as listed in the Server Article I linked you to (I have also seen it written about in other stuff I have come across)
However Little Snitch does not seem to confirm this either.
Most time it will be peer-to-peer like the AIM connections for this.
However some Jabber servers do not seem to allow this and have this Jabber65 Proxy set up which passes things Server to Server in between it leaving your end and arriving at a Buddy.
This on Port 7777 but you do not need to open this port (unless you are running a Jabber server)
I have yet to test File Transfers using a Yahoo Buddy List in iChat 6.
AppleCare and Geniuses.
Previously I have been contacted by Geniuses in Stores asking to test customer's iChat.
They and the Applecare people have details about Apple wants an designed the App to work.
What they don't have is the knowledge about what it takes to set it up in the "real world".
There are literally thousands of Makes and Models of routers.
Some like the Thomson-Alcatel brand state they are SIP/VoIP ready but this means the router strips out all SIP Data trying to send it to a Phone.
Early models of Alcatels can get around this with a tweak. Later models can't.
Motorola devices tend not to have UPnP.
Apple Base Stations have Port Mapping Protocol instead of UPnP and this needs setting up.
The Zyxel range definitely does not like the dual use of port 5190 and does much better using UPnP (You almost certainly have to do your AIM login on port 443 with these).
1. I have two computers (MacPro and MacBook Pro) that are both running Lion 10.7.2 and both running iChat 6.0.1. <<-- Fine
2. The Netgear router model is: WNDR3700.    <<<<--- With any Brand there are exceptions and I do wonder about this one
3. The firewall for both Macs is turned on and in the advanced area iChat is listed as being "allowed." <<<<---- Fine
4. In iChat, under the video options, "Screen Sharing Allowed" is checked.                                        <<<<<---- Fine
5. In System Preferences, "Screen Sharing" is checked and this is for "All Users" at present.               <<<<<---- Not Required
6. There are two separate AIM accounts being used for iChat purposes.                                            <<<<<---- OK
7. In iChat preferences, each AIM account is "Enabled" under "Account Information" and the "Server Settings" show the Server as "api.oscar.aol.com" and the Port is "443" and "Use SSL" is checked.                                <<<<---- As it should be
From this and the other info in the first port it was only the router set up that seem to throw some light on a possible cause (Port Forwarding and UPnP conflict)
If just doing Port Forwarding the ports listed would have covered things (Except the Screen Sharing's random port)
Regarding your latest post.
I have table similar to that on my Sagem 2504Fast Modem/router combined device and it too seems to list a different port on the external side on occasions.
I would try the router with the Disable SIP ALG unticked (so it is not disabled). If the Help info on the right gives any info about what this Netgear version does it would be helpful.
Some are like the Thomson-Alcatels I was talking about in that it points the SIP data to a specific place (Possibly a Phone socket on the device)
Others seem to provide an "boost" to enable SIP to work and don't seem to get in the way of iChat.
Try adding the Names in Table 1 from this page and see if you can Video to those.
There are 6 names in total (I am actually only seeing one on Line as I type)
9:19 PM      Wednesday; January 25, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

Screen sharing drive access problem

I have a Mac Mini I'm using as a media server. This mini has 2 hard drives and Mavericks installed in it. When I access the mini via screen sharing from my MacBook Air, if an no longer access the 2nd hard drive. It appears, and I can open the hard drive, but I can't access the folders on the hard drive. I can't access anything on that drive using applications, either.
This wasn't a problem using Mountain Lion. Any tips on how to fix this? All of my permissions are still set up correctly as they were before.
Thanks,
Bryan

Hey Guys,
I'm having this EXACT same problem, using this exact model of Belkin Wireless G Router: F5D7234-4 v4
We're both running the most current version of OS X, and when the user who is on the Belkin router plugs her MBP directly into her Comcast cable modem, everything works perfectly.
So given that the issue lies within the Belkin, I have remotely logged into the router and tried every possible combination of enabling and disabling:
- UPnP
- WMM
- Firewall
- QoS Monitoring
After doing this, we're still only getting audio whenever we try to screen share. As with the original post, we will start the screen sharing process, the window will say "starting screen sharing with....", but then we will only have audio.
Is my only other option to go through, set a static IP for this user, and setup all of the port forwarding per this article?
http://portforward.com/english/routers/port_forwarding/Belkin/F5D7234-4/iChat.ht m
Thanks in advance for anyone's help!!

Screen sharing in ichat 4 works on my MacBook Pro and does'nt work on imac

I am outside the US and Canada and I have a MacBook Pro and 3 imacs, 2 at my office and 1 at home. I used to use screen sharing among all of them but suddenly the imac at home does not allow sharing its screen, it only can share screens on other units, the (share my screen with...) command is faded but all other ichat features like video, speech and text are fine.
I reinstalled ichat again thinking that it could be corrupted but it is still the same.
I don't have a network or a firewall problem because when I use the same wireless network at home and login with my MacBook, the MacBook works perfectly.
I matched the settings of all units but still no progress.
I need help to restore that feature again.

If this happensd in the future go to USers/(your account)/Library/Preferences.
Delete com.apple.ichat.plist and restart iChat
If that does not work delete com.apple.ichatAgent.plists and restart iChat
It will be one or the other most likely the second.
Deleting them one at a time with a restart will pin point which one it is.
8:15 PM Sunday; December 16, 2007

Problems screen sharing w/ MacBook

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