I can't connect my server via apps but can on web browser

Right, docker deployment on my Synology NAS. I think your solution(edit the configure file) would solve the issue.
Overall I agree with you it would be better just set up a certification for my server
Is there any guide link how to get Let’s Encrypt in the Mattermost application? I’m unable to click Use Lets Encrypt as ‘ture’ on system console


Thanks for your help! :+1: