Cannot screen-share between iChat and Messages

I have the following computers:
--MacMini running 10.6 and iChat
--Mac Pro running 10.7 and Messages
--MacBook Pro running 10.8 and Messages
For years (prior to Messages) I have successfully undertaken screen-sharing with other people. Now I find that if I attempt to share the screen of someone outside of my local area network who is running iChat and system 10.6, I can only do this from my iChat computer. The two computers running Messages will fail to establish the screen-sharing session.
I have noticed that iChat signs into:
login.oscar.aol.com
Port 5190
Require SSL is unchecked
The Mac Pro signs into:
api.oscar.aol.com
Port 443
Use SSL is checked
The MacBook Pro signs into:
api.oscar.aol.com
Port 443
Use SSL is unchecked
Any ideas as to why screen-sharing should be non-functional between my two Messages computers and another computer running iChat?

Hi,
Error Messages were present in iChat 2 (the one called iChatAV in 2004) but only in the Connection Doctor.
In iChat 3 that appeared as Pop up as well on Chat Failures that could be expanded to see a Log. (referenced in the end of my signature block).
Apple had chosen SIP (Session Initiation Protocol) to make the connects between two Buddies.
In iChat 2 and 3 this was using the ports given over to SIP in an internationally agreed standard (ports 5060-5063)
One port at a time is used and they move upwards until a free one is found.
SIP phones for VoIP calls and Vonage adaptors also used this protocol.
Despite the international agreement many ISPs started to block the SIP ports, presumably due to loss of revenue from Long Distance calls. (Many said people could pay to have these Ports/services back)
At iChat 4 Apple moved the iChat app to using port 16402 as first choice for the SIP data.
The logs are still there in Mountain Lion and Messages but it does take a particular sort of chat failure to get them to appear. (it is more to do with the more common failures seem to be reduced now rather than being non-existent).
Messages is very much iChat with iMessages added on. (and then the Chat Window/Interface change).
What were iChat "Accounts" are accounts in Messages and you can get the Buddy Lists to display the same way as before.
The connection Processes are exactly the same.
I have had chats that seemed to be connecting but gave the "Connecting" messages with the spinning cogwheel "forever" but as you say it is a long time since I have seen one like that.
In those cases the Log is not produced as iChat or Messages does not recognised that the chat has failed.
In cases here this repeatedly happens it is best to start up the app using the Log generation mode in Terminal.
Quit Messages first.
Open Terminal (Applications/Utilities)
Copy and Paste the Bold text below into Terminal
/Applications/Messages.app/Contents/MacOS/Messages -errorLogLevel 7
This will cause Terminal to Launch Messages and produce a Log whilst doing so.
It will be quite long before it pauses when the Buddy lists are displayed.
The Log will be at a point that looks like this when that happens.
201835.893727 CommNAT result:
External IP: 94.xx.xxx.xx (editted)
External Ports: 16403, 16403, 16403
CNAT_BADTEST ....... 0
CNAT_ISFULLCONE .... 0
CNAT_ISPAT ......... 0
CNAT_ISPATHOST ..... 0
CNAT_TRYPRESERVE ... 1
CNAT_PATINORDER .... 0
CNAT_BLOCKIP ....... 1
CNAT_BLOCKPORT ..... 1
CNAT_LOOPBACK ...... 0
201835.893985 75 routing table entries found.
201835.894006 IPv4 DEFAULT route, if_idx:5
Then you can start a Video chat and the log will repeat much of what it checked on before (Camera, Mic, Bandwidth etc) and then will start the familiar "log" from the Error messages.
(you can quit Messages at this point so you are not interrupted by the log getting even longer)
Excerpts with comments Added
202448.040276 [[SIP/2.0 100 Trying
Via: SIP/2.0/UDP 94.xx.xx.xx:56634;branch=z9hG4bK6c37d0783ee0572b
To: "1002" <sip:[email protected]:16402> (Apple test Account)
From: "1001" <sip:[email protected]:16402>;tag=841964855 (My LAN IP)
Call-ID: 1e2a9eff6e27c18-a9ef-11e2-adb7-9209b4574012@192-168-0-11
CSeq: 1 INVITE
User-Agent: Viceroy 1.4
Content-Length: 0
o=ralph 0 0 IN %RTP-IP-AF% %RTP-IP% (Lists User Shortname)
s=1001
c=IN %RTP-IP-AF% %RTP-IP%
b=AS:2147483647
t=0 0
a=hwi:1056:4:2500
a=iChatEncryption:NO
m=audio %ARTP-PORT% RTP/AVP 110 12 124 3 0
a=rtcp:%ARTCP-PORT%
a=rtpmap:110 X-AAC_LD/22050
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:124 iLBC/8000
a=fmtp:124 mode=30
a=rtpID:784352988
m=video %VRTP-PORT% RTP/AVP 123 126 34
a=rtcp:%VRTCP-PORT%
a=rtpmap:123 H264/90000
a=rtpmap:126 X-H264/90000
a=rtpmap:34 H263/90000
a=fmtp:34 imagesize 1 rules 30:352:288
a=framerate:30
a=RTCP:AUDIO %ARTCP-PORT% VIDEO %VRTCP-PORT%
a=fmtp:126 imagesize 0 rules 30:640:480:640:480:30
a=fmtp:123 imagesize 0 rules 30:640:480:640:480:30
a=rtpID:308996905
If thre connection is successful and you end it then the Log adds a Bye message (Similar to the Trying one) and then checks its hardware abilities again.
There is much more to the log than I have said here but also much of it is also repeated.
SIP/2.0 100 Trying should be seen before the SIP/2.0 180 Ringing and the SIP/2.0 200 OK
You are probably going to looking for endless repeats of the ringing part.
202448.040529 [[SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 94.xx.xx.xx:56634;branch=z9hG4bK6c37d0783ee0572b
To: "1002" <sip:[email protected]:16402>;tag=219266045
From: "1001" <sip:[email protected]:16402>;tag=841964855
Call-ID: 1e2a9eff6e27c18-a9ef-11e2-adb7-9209b4574012@192-168-0-11
CSeq: 1 INVITE
Contact: <sip:[email protected]:16402>
User-Agent: Viceroy 1.4
Content-Length: 0
Some of the othe info in the log may prove useful such as the Bandwidth it finds (BWD)
202444.629246 BWD: GotBandwidth: 9080501/23966942 (up/down) @[11.0.168.192:0.255.255.255]
202444.629266 BWD bandwidth: 9080 kbits up, 23966 kbits down.
I don't need the whole log at this stage just highlights if you think they might point to things.
I would be keen to see the Bandwidth the app sees as this might be a clue.
The CommNAT details will also be useful.
You can Quit Messages normally and then Quit Terminal or just Quit Terminal and Confirm the Quitting of processes it is running.
8:53 PM Saturday; April 20, 2013
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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Ichat and messages aren't communicating on bonjour network

Hi there...i've been searching for some help to my question but haven't found it.
This is the problem.
at my office we have some Macs running ichat with snow leopard and other ones running messages with maverick.
When we try to chat between us, we can do it only if we are using the same app/os even when we can
see all the colleagues on the bonjour network...
to be more clear...
everyone is visible on buddy list, either we have ichat or message installed...
computer A running messages and maverick can send and receive messages to/from computer B running also messages and maverick and viceversa
computer C running ichat and snow leopard can send and receive messages to/from computer D running also ichat and snow leopard and viceversa
computer A/B (messages/maverick) cannot send or receive messages from computers C/D (ichat/snow leopard) and viceversa
hope there is a solution out there, thanks in advance for any help...

Hi,
Let me see if I have understood you correctly.
No matter what OS version or Messages or iChat Version all the Buddies show in each other's Buddy lists ?
Despite this only Mavericks with Messages 8 to Mavericks and Messages 8 will work with each and the same for Snow Leopard and iChat 5 based computers ?
What is not working in Mavericks to Snow Leopard (which is Messages to iChat 5) ?
Separate from using the iChat and Messages app do all the computers appear in the Finders Side Bar for Computer "Shares" ?
I have a NAS drive which uses Mac's AFP protocol and the Windows SMB protocol AND it can be set to be Time Machine Backup place and can do Bonjour Shares. (it appears 4 times in my list)
In addition to that I have my two other computers turned On (MacBook Pro and a G4)
This would tend to imply that the computers are all in the same part of the LAN (If the router has the IP of 192.168.0.1 only the last number should be different for all the computers)
My Computer is using WiFi (it's Airport card) to connect to the network.
The router is using the 192.168.0.x group as can be seen by the computer getting IP 192.168.0.17 in this pic
The Subnet mask should also be the same across all computers.
In addition no two computers should have the Same Name.
When I set up my computers I tend to use my own name so each computer then gets called "Ralph Johns's Computer" (it can't cope properly with the s at the end of my surname)
AS you can see from the Pic Above I have changed my Older G4 computer to be called "Ralphs' G4" and my Laptop to "Ralph Johns MacBook Pro"
These "Names" for the computers are also close to the names I use on the Address Cards for myself on those computers.
i.e. on the G4 the My Card in the Address Book list "Ralph G4" as my name. (My MacBook Pro does have me as Ralph Johns)
On my iMac I am posting from (Mavericks) I can called Ralph Johns-iMac in my Address Card.
It is these names in the My Card (Address book and Contacts list on each computer) that gives the Bonjour Buddy list the names of the Buddies.
Therefore I can see my MacBook Pro (Snow Leopard/iChat 5 and the G4 Leopard/iChat 4) in the Bonjour Buddy list.
To summarise the last section.
The computers AND the Address Card for the Mac user on that computer needs to be different in each case.
The Computer names show in the Shared items in the Finder's Side Bar and then the Address Book/Contacts Name appears as the Buddy in the list.
My iMac uses the Sig Pic I use here as the buddy pic. The G4 using Leopard and iChat 4 uses the Leopard skin looking pic and the photo one is used on my Snow Leopard/iChat 5 computer.
I have moused over the "Buddy" Ralph Johns to bring up the info panel also in the pic to show it is from my MacBook Pro which shows the computer name plays a part in this.
Cloning computers before upgrading them or even Cloning a Mac User account from one computer to another will cause issue if the Computer names or the My Card details are not changed.
I normally use mine for transferring Pics but I have also Texted between iChat 5 and Messages 8 today.
I hope this helps you find out which settings may need changing.
9:10 pm Thursday; August 21, 2014
 iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
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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.
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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.
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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#
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 iMac 2.5Ghz 5i 2011 (Lion 10.7.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
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Mac/Windows Networking in Leopard
The following articles outline how to set up networking between Macs using Leopard and Windows PCs:
Setting up a Windows computer to share files with Mac users
Setting up a Mac computer to share files with Windows users
Sharing with Windows computers
If you can’t connect to your Mac from a Windows computer
Sharing your computer with others on your network
More information is also available by selecting Mac Help from the Finder's Help menu and searching for the relevant terms such as "windows", "networking", "sharing", etc.
Also read:
Simple guide to Leopard/Windows Home Networking
Written by Intercepter121 and originally posted on the Apple Discussions here.
If your network complies to the minimum requirements described below you should be able to share resources without any need to enter commands in the terminal to modify configuration files in your mac.
Requirements
1. A decent router
2. Mac Os x 10.5.1 installed on your macs
3. Windows XP or Vista
4. Number of network devices <10
5. Some network printers or drives (NAS)
6. A decent ISP offering a good DNS service
General Settings
If your router offers DHCP and any of the device has power saving features there is a risk that the IP addresses are renewed. This can be problematic as the devices keep changing IP addresses. As this is your network is strongly recommended to reserve IP addresses to the MAC (Machine Address Code) of the various devices so that they can power on and off and still keep the same IP.This simple suggestion will greatly improve the browsing of the local network.
Accessing Windows Resources from Leopard with no authentication
Windows
1. Check the settings of the PC and ensure the IP addresses on the local LAN are trusted
2. Activate sharing on the desired devices ensuring the shares are read and write. If you use Vista ensure password protected sharing is disabled.
3. Try to access the windows share from another windows computer if available to confirm no authentication is required
MAC
1. Go into system preferences->security-Firewall check that the setting is not on allow only essential services. Recommended settings is allow access to specific
2. Go back into system preferences network. On the tab location click edit locations. Duplicate Automatic and call the new location Home. Now select the Home location and go into Advanced-WINS. In the workgroup field enter the same value that is on the other windows computers for example HOME. Now press enter then go back to the main screen. Select Edit locations and delete the location automatic. Now edit your location Home and rename it Automatic. This workaround is a leopard bug described here.
3. Give 5 minutes to allow all the other machines to broadcast their IP address and the other computers should appear on the left side of your finder window. You can now select the shares you want to connect. As no authentication is active if you are prompted with a user name just press OK.
The procedure to access a NAS is the same as above, just ensure permissions are set to files are read/write for anyone to avoid confusion.
NOTE: There is no need to activate SMB sharing if you don't want to allow the PC to read folders on your MAC
Troubleshooting
After you have followed all the steps you don't see any windows PC.
Identify the IP address of the machine you want to connect. In finder select Option+K and enter SMB://IPADDRESS. If you can connect you have a name resolution problem. Go into your router configuration and ensure that the option DNS assigned by ISP is selected and you don't have services like Open DNS in use and fixed IP addresses in that field. Apply the changes and reboot the router. You should start seeing windows PC in finder shortly after.
Your ISP DNS service is poor and you must use Open DNS or similar
If you are forced to use services like open dns you have the risk that the router propagates the DNS servers to your machines. As the implementation of SAMBA in Leopard effectively blocks the MAC to be a master browser for performance reasons you end in a situation in which tiger machines connect and leopard ones don't see a single share. Let's fix it.
1. Go into System Preferences->Network then advanced DNS if you see here the IP addresses of the open dns servers this is the case. Unfortunately you will be forced to change the hosts file.
2.Ensure you have reserved IP addresses to all your machines so that they always get the same IP.
3. Now login into your mac as administrator and go into utilities=>terminal.
4. Issue the following command sudo pico /etc/hosts
5. Now scroll down and enter all the IP addresses and computer names of any device you want to browse
6. Reboot your MAC
The windows devices will now appear in finder and you will be able to connect with Option+K.
You cannot access shares even entering the IP address
You have not reserved IP addresses to each machine. Go into your router LAN set up and make sure that is the case.
Accessing Leopard resources from Windows
1. Go into system preferences->security-Firewall check that the setting is not on allow only essential services. Recommended settings is allow access to specific
2. Go into System preferences->accounts and click on Guest flag the option Enable guest account to access shared folders
3. Now into System preferences->sharing select file sharing and then options here flag SMB and select the user that has to be logged into the computer when the share has to be accessed. Ensure that the folder you want to share has read/write or whatever permissions you like it to have set for Everyone
You should now be able to see your MAC in the windows network resources and access the shared folder with a double click without any password request.
Troubleshooting
You don't see any MACs from Windows
Check the firewall settings at the start of this post. Then go back to the Network configuration hit advanced and then TCPIP check is using DHCP and not a fixed address. Then check the sharing is set as above with SMB clicked. If SMB is not set you won't even see your mac from windows.
You see the MAC and the shared folders but you can't read or write on it
Ensure you have set the guest account to access shared folders. Then check on the sharing preferences that there is at least one folder with read permission for everyone. The classic case here is Dropbox that leopard sets as read and write for the user of the MAC but no access for other users. You try to click on drop box and receive an error but when you actually try to write a file you can do it. Check the permissions on the subfolders of the share as those permissions will prevail on the home shared folders
FAQ
You may want to do more complicated things, but first ensure you can actually share files without security in place so you can identify the root cause of your possible problems
I want to password protect my windows shares: once you have done the relative set up in windows vista and ensured you can connect from another windows machine you will need to use user name and password of the Vista user to connect.
I want to password protect my MAC shared folders: Go into user account and disable guest access to shared folders is no shared folder has to be accessed without password otherwise leave it checked. Create a new user for sharing (better than giving away your password) so that this user only accesses the folders you want to share. In System preferences network select file sharing SMB and flag only the new user you have defined. Then go back to the folder section and set the permissions you like on the folder you want to share for this newly defined user.
Good Luck

How to remotely "wake up" a Mac in order to screen share in iChat?

Apologies if this is not the right forum for this question.
I help my mother-in-law (81yrs) to maintain her computer (upgrades and all non-daily activities that she does not want to bother with) by remote Screen Sharing through iChat. This now works quite well.
However in order to screen share, her computer must be constantly ON, i.e. not be in sleep mode. Is there a procedure which would allow her computer to be turned into sleep mode after a certain amount of inactivity, but then be "woken up" remotely in order to do screen sharing?
Thanks in advance for any advice/suggestions/pointers.
Cheers from the Austrian mountains.
Veit

Thanks, Andy.
In another forum http://discussions.apple.com/thread.jspa?threadID=1340923&tstart=0 we found perhaps not the ideal solution, but a workable one.
Cheers,
Veit

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