Screen Sharing display of Finder app lags & black patches

I'm trying to share the screen of a headless Mac Mini with a Retina MBP over ethernet (via thunderbolt display and time capsule) using the built in screen sharing app, and my fourth generation iPad over wifi using a VNC app. My problems are as follows:
- intermittent black patches over the screen which I have drag a window over, or move a mouse over, to make disappear. This only happens on the Retina MBP, and doesn't happen on the iPad. This is considered solved in another thread, but the solution was to update Apple Remote Desktop which I do not have installed.
- On both Retina MBP and iPad, the outputted display does not update when I make a change in the Finder application. E.g. say I create a new folder. I will not see the folder I have created until I drag the window elsewhere.
This problem is the same regardless of the display quality (full or adaptive), or the resolution.
I appreciate any help.

Improve the Performance of your Headless Mac - Technological Simplicity

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IChat AV screen sharing display size limit?

My machine OSX 10.5.1, iChat 4.0 on 17in Powerbook; other machine OSX 10.5.1, iChat 4.0 on Macbook Pro WITH 20in Cinema Display connected as 2nd desktop. Connection is Jabber via an OSX 10.4.11 Server and is 'long-range' in the sense of being via the internet, not down the hall.
Sharing my Powerbook's screen works fine. Sharing the other way around hangs at 'Starting Screen Sharing'. However, if I reduce the resolution of the Cinema display by a few notches it works.
Screen sharing (i.e. the vnc://...) works both ways without messing with the resolution.
I'm trying to make this work as a support service for my clients, many of whom have this dual-display setup. I can't use Screen Sharing because the users are behind NAT.
Is there a known limit in the size of desktop iChat can share? And why would it be different from Screen Sharing? Any ideas gratefully received.

I have seen the screen shared display at different sizes on my Apple Cinema 17". (will be 5 years old on 22nd Jan)
As far as I could tell the differences were/are based on the Screen resolution at the far end.
As both methods are based on Apple Remote Desktop it would seem strange that there would be a difference.
I would say by casual observation that iChat's version does seem somehow to be more screen intensive.
My G4 connected to the 17" screen shows the MacBook Pro 15" display at full height and width (Less menu bar and DOCK) with VNC.
Some strange quirk is preventing me from doing it with iChat right now.
Does seem odd.
I have tried playing with the resolutions on both to see if it will work over Bonjour but no luck.
10:18 PM Monday; January 14, 2008

Is screen sharing through the Messages app encrypted?

The Messages app in Mavericks has the option to share your screen (Buddies > Share my screen...). Just learned about it today.
I've been wondering how secure it is to use over the internet.
Any thoughts as to if the screen sharing session is encrypted?
I'm using Mavericks, and haven't found anything that says if the sessions are encrypted or not.

Hi,
The Messages app can use different ID to use the different services.
It can use Apple IDs to use the iMessages service (Text Only) But you can invoke FaceTime from an existing conversation.
By default you also get the Bonjour Account.
If you have other Macs on your LAN (and they use iChat or Messages with Bonjour Enabled) you can Screen Share with them (in addition to Video Or Audio Only chats).
You can join the AIM service with some Apple IDs (ending in @me.com and @icloud.com in most cases and sometime @mac.com depending on your OS version) and of course with AIM or AOL registered Screen Names.
Mac to Mac (iChat or Messages) these can Screen Share over the internet.
Whilst the Login may be SSL (AIM almost insist on in nowadays) the Video chats, Audio Only chats and Screen Sharing are Peer-to Peer connections.
There are steps in the connection process to make sure you are not vulnerable to "Man-in-the-Middle" attacks.
They will only work AIM to AIM.
Jabber (Or XXMP) accounts can include GoogleTalk or Google Mail IDs in reality or Facebook chat IDs are valid Jabber IDs.
You can of course register for a Jabber ID on any other Jabber server you know about.
These will work Jabber to Jabber must be to a Mac using iChat or Messages and not other apps or web Browser logins (As you can do with both Facebook and Google).
The Yahoo account is text only.
8:55 pm Wednesday; July 16, 2014
 iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 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

Auto Accept with Screen Sharing with Yosemite Messages App

I take care of many of my family and friend's Macs and I'm really excited that screen sharing with 10.10 Yosemite through iMessage. I'm wondering if anyone know of a way to enrol their Macs into auto-accepting me to control the screen without the need for them to accept it. I know there was a way to do this back in the days of iChat.

Hi,
In Any Finder window use the Go Menu whilst holding down the ALT key.
Select the Library that appears and the navigate to Application Scripts/com.apple.iChat
Double click the Auto Accept item to open in in the Script Editor (formerly AppleScript Editor)
You will note the Text section at the top is commented out by being between (* and then the text and then *) the stars and parentheses.
Later a single line is also commented out with a # symbol
In iChat the section for Auto Accepting Screen Sharing used to be commentated out (originally it was not even there)
You might decide to comment out the other lines leaving just the bits you want. (or Copy the AppleScript and alter the copy).
Then you can go to Messages > Preferences > General Section and select the AppleScript as the Messages Received item.
NOTE
I have had issue myself with the AppleScripts as they stand in Yosemite.
I have tried several of those that are Included and some that I have collected from iChat and all return and error messages about timing out at present.
Others have reported the same in various Threads here at the Apple Support Communities.
At present there does not seem to be a work around.
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How to see only one of two displays in Snow Leopard Screen Sharing?

I am trying to set up screen sharing and find that since I have two monitors working on the machine that I want to connect to, two monitors show up on the client that I am connecting with. This causes a problem in that the scaled screen image that appears on my macbook pro is too hard to see and work on.
Is there a way to specify only one monitor image to appear in screen sharing?

On my Mac OS X Screen Sharing display, it has a display selection pop-up in the upper left side of the Screen Sharing display
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Display 1: 2560 x 1440
Display 2: 1200 x 1920

Screen Sharing ends up in a black screen

This morning I enabled Screen Sharing on the computer I use at home. I'm trying to connect from work and, for some reason, after I enter the username and password I get a window with a black screen, then nothing happens.
My brother says that at home the computer says that I'm connected, but I just can't seem to see anything from here.
Both computers are running Leopard, and to connect I use the program Screen Sharing within +System > Core Services+.

The black screen rather than an error message confirms that a connection has been established. The screen remaining black for a length of time probably means that the connection is very slo-o-o-o-w. Wait longer and the remote screen will appear, BUT if you have to wait that long you are likely to find that anything you try to do on the remote machine will take such a long time that the whole endeavour is pretty futile.
You need to find some way of improving the connection.

Issue with finder screen sharing.

My iOS development partner and I are currently having issues with screen sharing through the finder. Prior to installing OSX Mavericks there was no issue with adding each other as users to each others computer, but after the install is when the problem started happening. At the root level there are multiple users on each other's computers with our corresponding names but they don't appear in Users and Groups. So, having phantom users on each other's computers, we took them into the Genius Bar at our local apple store. They tried a few different methods, none of which worked, and had us reinstall the operating system and now we're back at square one having to resort to using the "permission" screen share as opposed to just being able to screen share directly though user accounts that we previously set in system preferences. I used the following console command, but it doesn't show the same accounts in the Users and Groups under System Preferences.: (dscl . list /Users | grep -v "^_") Any help or insight would be greatly appreciated.
Currently running Software OS X 10.9.1 (13B42) on both machines.

Found an answer at the following link.
https://discussions.apple.com/thread/5677786?start=0&tstart=0
Message was edited by: Shadowchief

Launchd cancels logout/restart and kills app when using screen sharing

I have an app I want to always run so I created a LaunchDaemon to keep it going:
<plist version="1.0">
<dict>
<key>Label</key>
<string>com.sns.sentinel.air</string>
<key>KeepAlive</key>
<true/>
<key>ProgramArguments</key>
<array>
<string>sh</string>
<string>/Applications/oc4j/restartSentinel.sh</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>
And restartSentinel.sh is very simple:
echo Process Sentinel.app is being restarted...
open -W /Applications/oc4j/j2ee/home/applications/Sentinel/Sentinel.app;
Everything seems to be fine but I have to access this machine via screen sharing. Then when I log in, the app gets shut down and only restarted a few minutes later. Also, when another user logs in, they are not able to log off. Launchd seems to cancel the restart.
I do also have two other plist files running other things but they seem to work okay (they don't crash, but the one which needs to be kept alive (code is almost the same as above) also seems to be preventing log out for users other than me).
So how can I get launchd to let people use screen sharing without killing the app and how can I get it to stop canceling logot/restart?

Try the Unix forum (not thread) under OS X Technologies.

Back to My Mac / Screen Sharing

I am trying to (and have had sporadic success with) controlling my desktop computer (at home, iMac, OS X 10.10) with my laptop (via Internet, Macbook Pro, OS X 10.10.1) through connecting through Screen Sharing from the Finder window's "Shared" computers. It's really hit or miss whether the iMac shows up in the Finder window, and I can't figure out why.
I've been all over websites and forum posts for information, and have learned a lot of things, but many of them are outdated. Here are some things I've done/learned about:
I can always log into my iMac through Chrome Remote Desktop, but I want the functionality of Screen Sharing.
I cannot simply start the Screen Sharing app and type in my icloud id, because that only allows viewing and not controlling the screen.
SSH through the terminal is hit or miss; it works more often than Screen Sharing does, but still not 100% of the time. I use it to copy files, but most of the time I need to be using the GUI.
A couple times the iMac showed up in Shared computers right after I did something, i.e. trace route to icloud.com or initiate a Screen Sharing session from the iMac, via Chrome Remote Desktop. Other times I've tried to jumpstart it like that and it doesn't work.
I've tried a variety of networks (home networks, workplace, mobile tethering) and I get different results every time, on every network. I might see my iMac in the Finder at work one day, and the next day it doesn't show up now matter what I do. So it must not be blocked ports in every case.
I've been taking notes almost every time I successfully connect, and I have documented cases where I can get it to work by (once again) going into my iMac via Chrome, disabling Back to My Mac and/or Screen Sharing, then re-enabling them. But of course, this hasn't worked consistently.
Any help or insight is appreciated. Again, this is all purely done over the internet, as accessing my home computer over a local network is of no use to me; I'm physically separated from it most of the time. (Most articles and walkthroughs teach people how to do it with their 192.168.x.x addresses, and they assume that your computers are always in your Shared section in Finder. This is not the case for me.)

That means that the Remote Management is turned on.
All you have to do is turn the Remote Management off if its not in use.
You may want to investigate how the Remote Management is being used to make sure you are not turning something off that needs to be on.

Why is Messages screen sharing icon grayed out?

Trying to do remote screen sharing with my mom's Mac using the new feature in Yosemite.
If you're not familiar with it, the new method does not require AIM, Jabber, etc and is independent of screen sharing settings in System Preferences (per Messages Help).
The procedure is:
In the main Messages window, select the name of the person you want to share with or, if you haven't previously exchanged messages, do so now.
Click 'details' on the right of the top bar of the main window.
In the menu that pops up, there are three icons: screen sharing, video chat, and audio chat/phone call. Click the screen sharing icon and send a request.
Today, my mom signed into her Messages account and we successfully exchanged iMessage messages (not SMS).
When I clicked 'details' the screen sharing and phone call icons were grayed out (or, more accurately, 'blued out' - they were a fainter shade of blue).
I clicked another name in the Conversations list and then clicked back to my mom's name. When I clicked 'details' this time, the screen sharing icon was no longer grayed out, so I sent a request to share her screen. She didn't receive the request, so I canceled it.
When I clicked on 'Details' again, the screen sharing icon was grayed out again. As far as I know, nothing had changed on my mom's end.
What could cause the screen sharing icon to be grayed out? And what could cause it to toggle back and forth between grayed out and normal?
Both computers are running the latest version of Yosemite, 10.10.3. Mine is a 2009 Mac Pro 8-core with 16 GB RAM, hers is a MacBook Pro from around 2012 or 2013.
Thanks!
Bob

Hi,
(He did say that he'd heard that due to changes in Google's system that their accounts no longer work with Messages.)
What he has heard and what are true are two different things
Logged in Google account
There are issues with Messages using SSL to login to the Google Talk server and Google saying SSL is Less Secure (there is a setting to Enable Less Secure apps like Mail that also uses SSL and Messages).
Some people find that 2 step Verification cannot be set at Google's Account settings if your want to use the Less Secure Apps setting.
1. I deleted my AIM account from Messages and had my mom do the same. The result is that we each only have two items in the Accounts window of Messages: an iMessage account (signed in with our Apple IDs) and a Bonjour account.
2. Clicking on the Details menu, the screen sharing icon was available for both of us. It was not grayed out.
This is using two different Methods of Screen Sharing in Messages (It is silly it has two but there we go)
For AIM use the Buddy List and the icons at the bottom or highlight the Buddy and use the Buddies Menu
DO NOT USE the Details option.
For iMessages start text chat then use the Detail Option an NOT THE BUDDIES Menu.
For the iMessages Method you have to Enable System Preferences > Sharing > Screen Sharing to allow the App to be Invoked.
(It is like FaceTime is invoked but only works to Macs)
As you mention the Connection Doctor only refers to the older "iChat Method for Aim and Jabber and Bonjour - if you can Video you should be able to Screen Share with that method.
9:49 pm Wednesday; April 29, 2015
 iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 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

Screen sharing in 10.8 slower than in 10.7?

Hi everyone,
I use screen sharing a lot with my 10.7 server and 10.7 clients. I have now set up a fresh installation of 10.8 Server, but screen sharing to it seems way slower on the same connection. It takes around 10 seconds to connect (2-3 seconds with 10.7) and the speed (i.e. when dragging windows or typing) is slower, too.
Did you encounter similar issues?
Thanks
Björn

I have what I believe is the same issue. Used screen sharing to connect to my headless (no monitor) mac pro early 2008 running Lion from my early 2009 Mac Book Pro 17" also running Lion. I had them connection view internet sharing over an ethernet cable. There was no lag, I could eaisly use program and even watch video.
After upgrading both to Mountain Lion now screen sharing is usless. Apps are slow, mouse movements do not track well and forget about video, it doesn't even render.
I did notice something interesting, if i do connect a monitor to the headless mac pro the issues go away. Everything runs smooth like it used to headless on 10.7 until i disconnect the monitor, then back to slow town.
Any ideas? I'm getting close to reinstalling 10.7 as 8 is useless to me at this point.

Screen Sharing vs Linksys WRT600N

Hi all. I hope someone here can help me out.
I'm trying to connect to a Mac Mini via a Linksys WRT600N. I can log on and transfer files properly, and screen sharing via VNC works perfectly. But Screen Sharing via Apple's app does not.
All firewalls are off. I have a wired gigabit switch in front of the router, and when I plug directly into the switch screen sharing works perfectly. But when I try and use it via the Linksys wirelessly it does not.
This implies that the computers are all set up properly, but that the LinkSys is not forwarding the screen sharing requests properly. Does anyone know how this might be fixed?
In case it matters, the Mini is running 10.5.8, and my MBP is running 10.6.2.
Thanks,
Jeremy

I guess its worth mentioning that although you can indeed screen share from Leopard to Tiger, it only works when you are on the same network. But Remote Desktop works across the internet...
Of course the trick to using Remote Desktop from a truly "remote" location elsewhere on the internet is that you have to be able to reach the IP of the computer you want to control, which can be tricky if its behind a NAT and the person your trying to reach is my Mom who has no idea how to configure her NAT, or firewall, or even find her IP address without my help.
Screen sharing Leopard to Leopard via iChat should be much more straight forward... translation: this will make my life much easier the next time my mom needs help.

ARD Screen Sharing is distorted at top and blank on sides

Hi there,
I'm having an issue with screen sharing on Apple Remote Desktop and also screen sharing through the Finder.
When I screen share with a Mac Pro which is connected to a projector the screen share looks like the image below:
The top is distorted and there is a large black bar to the right.
Would this have something to do with the screen resolution or interferrence between the Mac Pro monitor and the attached Projector?
This issue occurs even when the Projector is turned off.
Also, the mouse is not correctly lined up on the screen share, so to click on a text box I need to click a bit above the top of the text box.
The Mac Pro is part of a Mac Pro suite of 17 Mac Pros and I am having the same issue connecting to the troublesome Mac from all of the Mac Pros in the room. However, there is no problem connecting to a screen from the troublesome Mac. In this case, the image is fine.
The Mac Pro is a Mac Pro5,1 2.8QCX/10GB RAM/1TB/5779/SD (mid 2010). It is connected to a EIZO FlexScan S2202W LCD monitor and Hitachi ED-X42 projector. We're running Mac OS X 10.7.1.
The Mac Pros are all connected via ethernet on a Local Area Network.
All Apple and ARD software is up to date.
Any help with this issue is much appreciated.
Thank you!
Lawrence

Hi Brandon and slepping, thanks for the advice. Unfortunately none of your suggestions worked for me.
However, I think I've solved it!
I think it's to do with synchronising the screen resolutions of the monitor and projector.
Originally my projector resolution was set much higher than my monitor resolution.
I've lowered my projector resolution to the same resolution as the monitor and the screen sharing works much better now. Check the image below:
I'm sure I didn't have this issue in Mac OS 10.5 and 10.6. But hey ho, maybe a niggling bug that needs to be ironed out in Lion.
Thanks for all of your suggestions.
Lawrence

I cant get screen sharing to work on my home network

I am trying to connect my macbook pro to screen sharing so i can access it at my school computers, which are all iMacs running 10.6.6. When i was at school, and connected to the wireless network at my school i could screen sharing through the finder>go>connect to server. Once screen sharing was enabled i just entered the vnc address and it connected flawlessly. When i got home, and i set my netgear router( wireless-n 150 model: wnr100v2) for port forwarding start port: 5900 end port:5900 server name vnc, and set the ip address to my computer, and when i tried to screen share from another macbook within my network through the finder>go>connect to server, i could not connect. Oddly when i connected my mobile me, i cold screen share over the network. I want to do a WAN screen sharing and i cannot figure out how do do it. I would appreciate any help because it is very important that i enable this feature.

I'm a little confused by your explanation (it's late), so I am going to say what I think I read:
You want to set up your home computer so you can access it via screen sharing from school.
The home computer needs sys prefs sharing screen sharing enabled, and sys prefs security firewall must allow it, too. You port forward port 5900 through your home router to that home computer, which may or may not require that you use a static "192.168.x.x" (or "10.x.x.x" -- whatever the router's LAN subnet is) LAN IP address on that computer -- some routers require that computers acting as servers have static IPAs -- some routers don't.
You need to find out what is the public (internet-facing) WAN IP address that your ISP has assigned to your router; it is not the 192.168.x.x (or 10.x.x.x) address given to your home computer by your home router. You can find that by going to http://checkip.dyndns.com on your home computer. Unless you pay extra for a static public IP address from your ISP, ISPs may (and do) change it periodically on you without warning. So vnc://123.45.67.89 may work one day but not the next.
Some routers have a built-in feature to work around this by allowing the router to advise dynamic DNS servers of any changes in the public-facing IP address of the router. Of course, you need to have established an account with a dynamic DNS provider so you have a host name (like lomberg.noip.com or lomberg.dyndns.com). These are generally free accounts unless you want a special name that doesn't have the dynamic DNS provider as part of your host name.
If your router does not have this capability, these dynamic DNS providers have a piece of software that you will need to install on your home computer (the "VNC server") that reports changes in your public-facing IP address to their DNS servers.
Once this is done, then from afar, you can ⌘k to vnc://lomberg.dyndns.com (or whatever you set up your host name to be with dyndns or equivalent outfit) and you don't need to worry about what your ISP has done to you with regards to your public-facing WAN IP address du jour.
Note that with some (most?) routers, when you are on your home network, you will not be able to vnc to the host name or numeric WAN IPA in this manner. I don't know why it doesn't work, it just doesn't. I've had modems both ways -- my current ISP rental modem doesn't while the previous one (which broke so I had to replace it with my current POS modem) did. So in such case, you have to vnc://192.168.x.x of the "vnc server" computer when you are on the same LAN.
You are aware that on the client (school) machine, screen sharing preferences can be set to encrypt all data on the connection, not just the username/password negotiation piece, right? I don't know whether that setting persists across sessions or only persists for the duration of the current session. I wouldn't want my client mouse/keyboard and "server" screen video to be transmitted in the clear; that's why I bring this up.
Does that answer your question? Or did I totally misunderstand what you were asking?

If Your Screen Sharing Stops Working, Read This

SCENARIO: I have a network of Macs. On my main machine (a Mac Pro), I have set up bookmarks in Safari that link to the Screen Sharing URLs for other Macs on my network (Mac minis, MacBook Air). For example:
vnc://192.168.1.51
vnc://192.168.1.52
So I can kick off a Screen Sharing session with one of those Macs simply by clicking the appropriate bookmark in Safari.
PROBLEM: Sometimes when I do this, one of two things happens... either the Screen Sharing program launches in the dock but the window for the other Mac does not appear at all, or the Screen Sharing program launches and a small black window (with nothing visible inside) appears. Killing and restarting Screen Sharing does not help, and restarting the remote Mac does not help.
SOLUTION: One way to solve this problem is to restart the Mac where you are attempting to use Screen Sharing. But this is overkill; it works because it incorporates the second, easier solution to the problem:
1. Launch the Activity Monitor program.
2. In the Process Name list, look for "NetAuthAgent". It may show as "Not Responding".
3. Select NetAuthAgent, and then click Quit Process (the red stop sign button at the top of the Activity Monitor window). Then, click Force Quit.
Your Screen Sharing should now work.
It appears that as part of connecting to the remote Mac, your Mac must authenticate itself... and NetAuthAgent is part of this process. If this program freezes, hangs, or locks for any reason, the authentication will not work, and you cannot use Screen Sharing. Killing NetAuthAgent is harmless, as far as I can tell, and it will automatically relaunch the next time it is needed.
For anyone else having problems with Screen Sharing not working correctly, I hope this information helps.

having related problem with NetAuthAgent
"loginwindow" process in activity monitor is Not Responding constantly (through warm and cold reboots)
this causes a number of problems, slow network performance, hangs, no ability to restart/shutdown
killing "NetAuthAgent" is the only way to make "loginwindow" process responsive again
and restores lost functionalities
having this problem across three networked machines (macpro, macbook pro, mac mini) all running 10.5.2
have reapplied the 10.5.2 combo upgrade but no fix. only witnessed this problem since 10.5.2

Screen Sharing display of Finder app lags & black patches

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