Put the summary of the bug you're having here

*What I expected to happen was to log in to a server regularly. *

What actually happened was it said that : failed to log in: the authentication is down for maintenance, but my friend logged in normally. I tried to refresh, relogging, but it all did not work
Describe what happened here

Steps to Reproduce:
1. join a server, wait a while
2. it will pop out
3. ...