And i can confirm your both confirmation. I can't even start this service manually.


EDIT:
Ok, so i found a solution.

Don't use RDP to connect with your GOG host computer. Install Parsec app. Via Parsec GOG is working normally.

I mean. That's not really a solution though. Sure. We can use parsec, or a VM or even Chrome Desktop as a Band-aid to the situation. But this has been an issue for years now and needs to be actually fixed by GOG.

I just ran into this problem. I finished building my new gaming PC, and since I only have one monitor, I I'm using RDP from my old PC to set things up so I can play games while I'm copying files from my backup drive. I got my GOG games copied over, but I went to install Galaxy to download some new games tonight and got the error.

Running MacOS Sequoia 15.2

Also getting the
"GOG Galaxy - Error / Connection to GOG Galaxy Communication Service was lost / Galaxy will now shutdown"
popup on startup.

the shell script to start the communication service before GOG Galaxy did work for me, but it was annoying so I kept looking...

Turns out I had disabled GOG Galaxy in the Settings -> Login Items & Extensions
(I routinely turn things off in here after enduring the horrors of Windows for so many years)

Enabling it made it open no problem every time... Leaving this here in case anyone else has the same issue.

Got an email today saying there was a new Gog client.

1. Deleted the old install from /Applications.
2. Downloaded the latest package
3. Installed & Launched
4. "Connection to Communication Service was lost and could not be restored! GOG Galaxy will now shutdown."

I had hope for a second...

Most software companies use error reporting to monitor the pain their users are going through. I guess this isn't true for Gog. They don't even check these forums.