Mojave security update 2021-004 breaks screen sharing after system has been idle

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Mojave security update 2021-004 breaks screen sharing after system has been idle

After installing Mojave security update 2021-004 (on 6/5/21) there is odd behavior of both screen sharing and Microsoft Remote Desktop. Immediately after rebooting, I'm able to use screen sharing to view the screen of another Mac on my local network. I'm also able to use Microsoft RDP over VPN to connect to servers at work. However, if I leave my machine idle for a hour, or so, I can no longer make a new screen sharing connections nor can I make a new RDP connection (existing connections are OK).

Hardware: MacBook Pro, 15 inch 2019, 2.3 GHz core i9, 32 GB RAM

OS version: 10.14.6

Energy saver: [x] Prevent computer from sleeping automatically when the display is off

Other updates installed on 6/5/21:

Safari 14.1.1

OneDrive 21.083.0425

Any help would be appreciated.

MacBook Pro

Posted on Jun 7, 2021 5:37 PM

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Answer 1

mkaiser996 Author

Level 1

8 points

Jun 13, 2021 8:46 AM in response to BDAqua

The in-place OS reinstall solved the problem!

Thanks for you help, @BDAqua

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Answer 2

BDAqua

Level 10

250,259 points

Jun 7, 2021 6:32 PM in response to mkaiser996

Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes.

Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.

EtreCheck is a FREE simple little diagnostic tool to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac. It will not display any personal info.

https://www.etrecheck.com/

Pastebin is a good place to paste the whole report if you capture the URL while there…

https://pastebin.com/

Whew, they've changed pastebin & made it harder, but after pasting in, click Create new paste button, then Embed button, then copy the URL...

The important part of the above is...

https://pastebin.com/embed_js/KuvnghqA

Workable but harder for me to work with...the Note tool on the bottom of this editor's toolbar, as shown in the image, to copy and paste the output from EtreCheck. In a Reply before you click post, look for this to add longer texts...

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Answer 3

mkaiser996 Author

Level 1

8 points

Jun 14, 2021 12:38 PM in response to Ed_Heel

Hi @Ed_Heel,

An in-place OS reinstall from the recovery partition reinstalls the OS, with all of the latest updates, leaving all of your settings and custom extensions in tact. During the installation there are checks for compatibility of custom extensions.

Assuming you have Intel silicon, shut down your system, then press CMD-R while restarting, until the apple logo appears.

See: https://support.apple.com/en-us/HT204904

Good luck!

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Answer 4

BDAqua

Level 10

250,259 points

Jun 9, 2021 4:21 PM in response to mkaiser996

Did Windows get an update recently???

Delete this file & restart...

/Library/LaunchAgents/com.microsoft.OneDriveStandaloneUpdater.plist

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Answer 5

mkaiser996 Author

Level 1

8 points

Jun 10, 2021 3:53 PM in response to BDAqua

I'm not aware of a recent Windows update. Since my connection issues include Synology NAS devices that run their own OS, I don't believe it is a Windows RDP server issue.

I did delete the file you suggested, restarted, but alas, the same badness occurred after an hour, or so. I also deleted all of my system cache files, from /Library/Caches, except com.apple.kext.caches, booted into Safe Mode, then restarted in normal mode. No benefit. I'm currently doing an in-place OS reinstall, and I'll let you know tomorrow if it helps.

thanks again!

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Answer 6

mkaiser996 Author

Level 1

8 points

Jun 9, 2021 2:40 PM in response to BDAqua

Thanks, @BDAqua:

I've created an EtreCheck report:

https://pastebin.com/embed_js/qNPRYPb7

I have not yet booted into Safe Mode but will do so tonight. I don't expect to have the appropriate drivers available in Safe Mode to do RDP.

Another piece of information: After boot I can connect to NAS devices via afp:// or smb:// but after an hour or so I can no longer make any new connections. The existing connections are still active.

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Answer 7

BDAqua

Level 10

250,259 points

Jun 10, 2021 5:51 PM in response to mkaiser996

OK.

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Answer 8

BDAqua

Level 10

250,259 points

Jun 13, 2021 11:24 AM in response to mkaiser996

Good work, thanks for the report & take care my friend. :)

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Answer 9

Ed_Heel

Level 1

8 points

Jun 14, 2021 11:35 AM in response to mkaiser996

I have the same problem. Can you tell me what is meant by an "in-place OS reinstall", please? Does this retain the security update or is it a way of discarding it?

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Answer 10

Ed_Heel

Level 1

8 points

Jun 14, 2021 1:00 PM in response to mkaiser996

Thanks, @mkaiser996. If this worked for you, maybe I should give this a try.

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Mojave security update 2021-004 breaks screen sharing after system has been idle

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