'How to test for asp.net login issue on remote web server?

I have a ASP.NET webforms/MVC project that uses ASP.NET Identity. User logins work fine on my local machine and have been working fine for the last year on the remote web server. Recently users started experiencing login issues. The login page would just take the user back to the home page without logging them in. I cannot replicate the problem on my local machine. What can I do to test/debug it on the remote web server? I thought it might be a CDN caching or firewall issue, but I disabled both and the issue persists.



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