pfSense

To reproduce:

• Install pfSense 2.4.2 from scratch.
• Assign interfaces, configure an IP address and DHCP server for the LAN interface.
• Open webConfigurator from a PC on the LAN network (via HTTP and the IP address).

Behavior observed:

• The login page appears.
• When I enter the default credentials and click Sign In, the text boxes are cleared and I get the same login page again; no error message is displayed.
• The system beeps and reports a successful login on the console.

Expected behavior:

• webConfigurator loading after supplying correct credentials.

System configuration:

• Server side: pfSense 2.4.2, AMD 64, serial console, installed via USB Memstick installer on ALIX hardware
• Client side: Ubuntu MATE 16.04, Firefox 58.0.2

Additional information:

• When I enter an incorrect password, the login page displays Username or Password incorrect in the top bar; this does not happen with the correct credentials. Also, login attempts with incorrect credentials are logged as such on the console.
• I was able to log into webConfigurator from a Windows 7 PC, also running Firefox 58.0.2.
• I then restored the configuration from my previous 2.2.6 setup, which contains SSL certs and blocks HTTP access to webConfigurator. After that, login from the Linux machine worked as well.