Screen sharing stops working after disconnecting for about five minutes

remote desktop

I'm running macOS Mojave on a Mac Mini. Built-in VNC server works perfectly when you connect for the first time after reboot, however if you disconnect from it for more than five minutes you can't connect again – it displays the username that was used for the last session and a spinning wheel. Connecting via ssh and killing screensharingagentd doesn't help, only a reboot does. I've verified all the power saving settings are off. There are two virtual machines with macOS High Sierra and Sierra running on this same Mac Mini and I can connect to them without any issues.

Best Answer

My workaround for this problem is to login via ssh and kill loginwindow process:

sudo pkill loginwindow

This will allow to login via VNC then.

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Mac – Builtin VNC stops working after waking headless Mac mini from sleep (black screen)

This was eligible for me: edit /Library/Preferences/SystemConfiguration/com.apple.Boot.plist like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Kernel Flags</key>
    <string>darkwake=0</string>
</dict>
</plist>

and restart your mac. Mountain Lion forces me to enter password twice but it wakes up and works.

Screen sharing suddenly stopped working

Go to System Preferences -> Security & Privacy -> Firewall -> Firewall Options and remove anything in the list box lower section that has to do with screen sharing. You can remove an item by highlighting it then clicking the minus button below the list. Click Ok.

Next go to System Preferences -> Sharing and uncheck Screen Sharing.

Reboot. I don't know why this is needed and I hate that it is, but it didn't work for me to do this without a reboot.

Then go back to System Preferences -> Sharing and recheck Screen Sharing.

Best Answer

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Mac – Builtin VNC stops working after waking headless Mac mini from sleep (black screen)

Screen sharing suddenly stopped working

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