Universal Control No Longer Working Between Macs after update to Ventura 13.3

I'm in the same boat and it finally came down to the same issue with my firewall as written by this reddit user: https://www.reddit.com/r/MacOS/comments/124v25i/comment/je6bngz/?utm_source=share&utm_medium=web2x&context=3

I had to re-enable the firewall on my Intel macBook, reboot it, toggle my WiFi/Bluetooth and Universal Control settings, then Universal Control popped back up in the firewall settings with incoming connections allowed, and started working again. Good luck!

Followed the instructions in the reddit thread but no help.

Every time I click on the Universal Control.app to launch in Macintosh HD>System>Library>CoreServices to reset the firewall I get the following message alert:

"The application “Universal Control.app” is not open anymore."

and the console app spits out the following upon inspection:

13:45:52.538827-0400 uiagent com.apple.launchservices handle LS launch error: {\n AppPath = "/System/Library/CoreServices/UniversalControl.app";\n ErrorCode = "-600";\n}

13:45:52.563499-0400 agent com.apple.universalcontrol keyFocus: deactivated by losing front-most status

13:46:20.191381-0400 CLinkD com.apple.rapport E93FCAFC.skipped.nilClientCnx: UniversalControl:671, ControlCenter:543,

13:46:20.191451-0400 CLinkD com.apple.rapport E93FCAFC.skipped.missingFlag.trustCircle: UniversalControl:671, ControlCenter:543, knowledge-agent:495, ContinuityCaptureAgent:523, homed:528, cloudpaird:787, UniversalControl:671, biomesyncd:672, homed:528, assistantd:668, sharingd:551, assistantd:668, rapportd:504, sharingd:551, assistantd:668, assistantd:668, ControlCenter:543, ... -1 more not shown

13:46:20.191507-0400 CLinkD com.apple.rapport E93FCAFC.skipped.statusControlFlagMismatch: UniversalControl:671, ControlCenter:543, knowledge-agent:495, ContinuityCaptureAgent:523, homed:528, cloudpaird:787, UniversalControl:671, biomesyncd:672, homed:528, assistantd:668, sharingd:551, assistantd:668, rapportd:504, sharingd:551, assistantd:668, assistantd:668, ControlCenter:543, ... -1 more not shownidentityservicesd:525, ... -15 more not shown

I'm experiencing what @ForeverTangent is seeing. I just updated BOTH my i7 MBP and M1 Air to 13.3. There are no updates available for Xcode, the firewall is not enabled on the MBP (the UC 'primary') and enabled by policy on the Air, e.g. I cannot disable it. I'm seeing the following ERROR in the Console when I try to launch UC from Finder

Process: CoreServicesUIAgent
Message: handle LS launch error: {\n    AppPath = "/System/Library/CoreServices/UniversalControl.app";\n    ErrorCode = "-600";\n}

Check: "Displays have separate spaces" This option must be ON to use universal control.

MacOs 13: (go and check) System Setting--> Desktop & Doc -->under Mission control: Displays have separate spaces(ON).

What happened to me since updating to Ventura and the latest version of UAD's console software is, Console works, but no longer opens it's window on startup. And I CANNOT shut down without Force Quitting Console. My iMac (essentially) stays "frozen open" until I force quit Console, and then it shuts down.

Logged out of iCloud on iPad and iMac and then back in and then rebooted both, seems to be working now. Thanks for the tips. Only thing is now all the items I had saved on my desktop appear to be gone. Any suggestions?

I had problems using UC between two Macs where it randomly disconnected. My main Mac was connected to an external monitor to its right and to the right of the monitor was my other Mac.

I read an article saying that ideally the devices should be within 1 meter of each other. Mine were maybe 1,2 meters apart.

I tried moving the second Mac to the left side of the first Mac and Voila, everything works flawlessly.

Not saying this solves your problem but might be worth a try ...

Howdy everyone. Thank you all for the great input.

I hope this might help someone with the same frustration I was in: after reading all the solutions, I decided NOT to sign out of iCloud, and just RESTARTED iMac with Ventura (won´t update the OS further, mid 2017) to have Universal Control back (stopped working for no reason) from a Macbook Sonoma, which did NOT work.

After SHUTTING DOWN the iMac, UC started working again. Now, the Macbook sits in front of the iMac and the keyboard switching hassle is gone.

Best to all,

I had the same exact issue with my macbook air and my iMac. My iMac would connect to my iPad but not my Macbook, I wanted to do UC with all 3. After reading this thread and trying almost everything, the only one that worked was signing out of apple id on my iMac and Macbook & restarting both, sign back into both (signed into my Macbook first) and after a few moments UC started working together with all 3. Thank you to the person who suggested signing out of apple id. Apple has to fix this issue.

Agreed! This is incredibly frustrating. The logging out method worked a few months ago and again today. It's great that this works, but I would appreciate it if Apple prioritized fixing this issue. It's quite disruptive.

Didn't work for me unfortunately. Right now it works on my Mac Mini with my 12.9" iPad M1 but not my Macbook Pro M3 Max, I spent literally weeks with Apple support until they completely ghosted me, I'm really gobsmacked this is how a trillion $ company treats their customers.

Holy crap!! Tried rebooting multiple times before updating from Ventura to Sonoma (Was reluctant as I heard it slows down Macbook Air).. Then reboot multiple times again as the update did not fix the issue.

After reading this.. tried and it worked immediately..

[Edited by Moderator]

This just hit me as well. I've followed numerous postings on line and made sure all the settings are correct. First, a restart of both devices worked (as non-ideal as this is), but now, this also isn't working. There has been no software updates between things working and things not.

This worked for me too - Thanks BeyondBay!

Logging in and out of iCloud didn't work. I could see my other mac in the Displays [+] dropdown, but couldn't push through to its display.

Once went to my AppleID settings and clicked on the Mac under the Devices list, I could then push through to its display.

@APPLE please fix!!!

Read this solution! it worked for me Universal Control not Working. "add displ… - Apple Community