macosmessagesscreen-sharing
I'm trying to screen share on from within the Messages app with another iMessage user. We're both on Yosemite, and we've successfully used Messages's new screen sharing feature many times. One day, we discovered the screen share button was disabled. It has never come back.
Screen sharing is enabled in the Video menu, and we are both on the most recent version of Yosemite. I'm not sure how to look for answers without even an error message to go on.
Since the Screen Sharing feature seems to be the only one unable to connect, the best way to diagnose its behavior is by using the application directly.
Please, launch screen sharing located in:
/System/Library/CoreServices/ScreenSharing.app
The application has no visible "UI" so don't expect a fancy Cocoa interface. Instead, once you have loaded it, all you'll see is this "poor" icon in the Dock:
Click on it and then go to Preferences in the Mac menu bar. You should be presented with:
Notice the second option to only encrypt passwords and keystrokes. That's fine, but as you can see, there's no option to skip encryption altogether. Some VNC versions have incompatibilities with encryption, but this would be rather shocking since you're talking about OS X vs OS X.
In any case, once you have the settings like that, try connecting, again, in the menu bar: Connection -> New (or ⌘cmd + N).
A simple dialog appears asking you to enter the Host's name. Following your screenshots, try: 192.168.1.99 and hit enter.
We'll see what happens from here. Also, have the Console.app open on both computers, to see if there are any System messages going on (or anything related).
ssh into the remote Mac and kill the screensharingd daemon.
$ ps ax | grep screen
1234 ?? Ss 0:00.02 /System/Library/CoreServices/RemoteManagement/screensharingd.bundle/Contents/MacOS/screensharingd
$ sudo kill 1234
It works for me. I have Mac OS X Lion on both local and remote computers.
Best Answer
I just used Yosemite's screen sharing via Messages.
Getting it to work on both sides required me to enable back to my mac in System Settings under iCloud. After restarting the Messages app on both sides those two rectangles became active and screen sharing worked.