I’m running WordPress network on Nginx Web Server and I’m facing login issues on my site when any user tries to login. When normal user can login, their session is terminated after some time somehow. If they want to login again, they need to clear cache and cookies and it works for little time and they are kicked out of the session. That’s very annoying.

I can login in the network administration page without any issue.

I don’t know what could be the cause of this. Everything seemed to work fine earlier. Please, help.