Login screen keeps popping up

I have a SharePoint Dev server where I restored the CDB of production.

If I RDP on the server, I can log on to the site with no problems (Loopback check has been disabled).

However, if I or anyone else tries to log in from a different computer, the login windows just keeps popping up.

The Web Application is using claims-based authentication and I tried different providers: kerberos, ntlm, basic. The same behavior all the time.

I tried running the following command but that did not help either:

$wa= get-SPWebApplication $WebAppName
$wa.MigrateUsers($true)
Any suggestions?