I recently had someone ask my why they could telnet into a Symbol WS5000 but couldn't connect to the switch via Internet Explorer to use the web GUI.
It's really quite simple, the default web interface is HTTPS not HTTP.
If the IP address of the WS5000 was 1.2.10.30 you would use the following URL
https://1.2.10.30. If you used
http://1.2.10.30 you would get a 'Page not found' error from Internet Explorer (or whatever browser you might be using).
Cheers!