Here's my http configuration from a 1638. And don't forget to set a default gateway:
ip route 0.0.0.0 0.0.0.0 10.101.0.1
http authentication LoginUseRadius
http session-timeout 14400
Can you access the box any way other than console? Telnet, SSH?
For the GUI to be accessible you have to turn it on, setup the IP, and have a Username/Password setup. You can create one from enable prompt:
1) configure terminal
2) username * password *
I have enabled it, set ip address, added username and password. I have not defined a default route. I have done this several times, but dontt remember setting up a default route for the switches in order to access the GUI. I will give that a shot.
Have not tried to access it other than console and GUI
If you are still having issues can add the show run of the device? Also where are you trying to access the device from--is the computer hookup directly to that switch?