Please check connection, Mattermost unreachable. If issue persists, ask administrator to check WebSocket port

[agriesser (Alexander Griesser)]

Alright, thanks for the answer.
Since you’re running Mattermost on QNAP: Could you have a look at the following thread and maybe helpe me help the other user here to find out where the directories are?

NAS backup procedure

Of course I can google for how to set it up, but this does not answer how YOU set it up and since you’re having a specific problem, I’m trying to find out how to reproduce your specific problem and the more detailed information I have, the better I’m able to help. I’ll see if I can get my hands on a compatible box to run some tests on it, might take some time.