How to troubleshoot login failures caused by unsynchronized server time: A record of handling NTP drift

Problem encountered: Last week while on duty, I encountered a fault that was quite easy to misdiagnose. Customer service colleagues reported that several remote employees could open the system homepage, but were kicked back to the login page immediately after logging in, and occasionally received an "MFA code expired" error. On the frontend, it looked like a session loss. The Nginx access log…