I just reinstalled my pfSense on scratch (previously on 2.2, now on 2.4). I’ve assigned the interfaces, configured an IP address and DHCP server for the LAN interface and opened the web configurator from a PC on the LAN network. I get the login page, but when I enter the default user and password, I just get the same login page again.
The pfSense beeps and on the console reports a successful login. The login page is the same as before, no error message or anything else.
If I try with an incorrect password, the login page displays Username or Password incorrect in the top bar and an authentication failure is logged on the console.
Browser is Firefox 58.0.2 on Ubuntu MATE 16.04 (64-bit).