User of Mac OS ver 10.15.4 Catalina here. I have the same problem. Galaxy worked on my mac for once after I have installed it and never after.

If you're installing in a remote desktop window, ifilgud's post above has the answer.

Hi, use my config.

In some case Win change settings to shut off in that destination, must be change to automatic.

I just updated Windows 10 to v2004, and this happened. Wish I saw this first before I reinstalled GOG Galaxy and the issue just reappeared. Going into services and switching GalaxyCommunication back to Automatic indeed fixed the issue.

I're RIGHT! It worked for me, I love you :)

Didn't work for me. I set Galaxy to automatic and it still give me the bull warning, which won't let me get rid of it even though GoG is running fine and I can use it with the warning hidden behind GoG, but if I X it away or click okay it seems to force crash GoG Launcher even though it is working.

I'm getting this on a fresh install of Galaxy on a very vanilla Win10 install.

Since it's a completely fresh install, I don't imagine reinstalling will help..?

From searching forums, seems like this has been an ongoing issue for *years*, why is it still a problem?

I do not have "CryptoPrevent", and running C:\ProgramData\GOG.com\Galaxy\redists\GalaxyCommunication.exe seems to have no effect.

galaxy what a wonderful app :P

I'm having the same issue; this seems to come up and I've tried everything including:
Reinstalling GoG
Reinstalling my Windows 10 installation
Running C:\ProgramData\GOG.com\Galaxy\redists\GalaxyCommunication.exe on start of GoG.
Running C:\ProgramData\GOG.com\Galaxy\redists/GalaxyCommunication.exe on its own to see if there are any errors on start up (nothing seems to happen).
Uninstalling GoG, deletting anything related to GOG in C:\ProgramData and %APPDATA% and E:\Program Files (x86)\GOG Galaxy (I install to E: as that is my game drive).
Tried setting GalaxyCommunication service to Automatic.

There are countless other posts above me with similar issues; but no comment from GoG at all; so are we to assume there is no fix and I should just stop using GoG and go elsewhere for games?

I'm getting this error as well. It worked back in october but has stopped working:

2020-12-07 10:20:36.212 [Information][ (0)] [TID 19448][comm_service]: Log started. Application version: 1.2.43.23 (2020-02-11 12:26).
2020-12-07 10:20:36.213 [Information][ (0)] [TID 19448][comm_service]: Operating system: Windows 8 6.2 (Build 9200) (IA32)
2020-12-07 10:20:36.537 [Warning][ (0)] [TID 19448][comm_service]: SessionID is not equal to ActiveConsoleSessionId while getting process token from process explorer.exe, error code= 0
2020-12-07 10:20:36.538 [Warning][ (0)] [TID 19448][comm_service]: Failed getting token for process explorer.exe, checked processes: 248.
2020-12-07 10:20:36.538 [Error][ (0)] [TID 19448][comm_service]: Failure getting the explorer.exe token. Last error code: 0
2020-12-07 10:20:36.538 [Warning][ (0)] [TID 19448][comm_service]: GetCurrentUserSID() failed

I contacted support and they answered withing a short time frame. In my case this was likely caused by the firewall. I added exceptions to GalaxyClient, GalaxyClientService and GalaxyCommunication to firewall exceptionlist.

I also added GOG Galaxy folder and ProgramData\GOG.com\Galaxy\redists to anti virus exclusions.

If you have Hyper-V enabled, try turning it off, it worked for me.

tried everything including firewall exceptions, uninstalling. disabling hyper v worked.

Um... what do you mean, you're unable to use your account anymore?
You don't need the galaxy client to access your account.
Just download your games normally, form your account here - https://www.gog.com/account