We have a stack of four 6248 switches running v3.3.3.3 firmware, which used to be pingable and I could access via http, but since one of my colleagues did some work on them a few months ago, we can do neither. Although I have access through the serial port, the stack handles all the traffic for our Head Office network, so I'm reluctant to interfere as I don't really know enough to diagnose the issue without affecting all our users and processes.
Any help would be greatly appreciated
Cheers, Stu