504 Gateway Timeout ERROR

Hi, I’m getting is error message, please assist.

See Search results for '504 Gateway Timeout order:latest' - Manager Forum

It also happens to me.

Manager Cloud login
Try this URL and enter your subdomain and your administrator credentials.
If a subdomain is found and you successfully log in, you can try a manual restart of your server.

Actually it’s my subdomain and should be found but have no idea why is it suddenly missing. I try to login via cloud.manager.io use that subdomain and success then gonna try your suggest.