Reverse proxy loads but cannot login

Reverse proxy loads but cannot login

Hello,
I have a nginx reverse proxy working however when anyone tries to login, the page simply reloads. No error message is displayed. If someone tries to login with wrong credentials, it errors wrong username/password.

Any idea what I can check? I had this working on IIS reverse proxy for about a day before it broke and then IIS became useless so I switched to nginx where it's having the same behavior.

Thanks!

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