I am having the same problem as OP.  I have logged into the avalon 741(using a laptop I switched IP ranges to match the Avalon) and switched the IP address range of the Avalon to match my network. 

I can now connect and log into the Avalon from my network. 

I logged into the menu and updated the pool info with the correct info, copied/pasted from pool page, and updated the worker with username.workname, and password of x.   The miner is not mining for some reason.  Any ideas on why it is not mining?