Topic: Unable to login on DD-WRT and Tomato based routers

I can login to all of my routers with Firefox.

With Epic, I can login to my stock TrendNET and D-Link routers,
but I cannot login to any of my DD-WRT or Tomato based routers.

I am running Epic Version 62.0.3202.94 as installed (no changes).
The steps are:
Enter the address of a router (192.168.xxx.xxx) in the address bar
Enter the User Name and Password in the dialog box and click "Log In"
On DD-WRT and Tomato based routers, the window flashes and the "Authentication Required" screen reappears.

Any suggestions?