Hello,
Depending on your networker version, IP may or may not play a roll in 
server being disabled, older versions of Networker servers were IP address 
dependent, i am surperised though, since you should have got 15 days grace 
period after changing IP and if you say it happend right after the change 
that illudes me to other issues,( i could be wrong on the grace period)
Please check nsrlic output from nsr\bin directory to confirm, your logs 
will also indicated if your server is disabled.You will need to contact 
EMC to re-enable it.
Check to make sure your Tape lib is hooked up properly and the drives are 
recognized by the OS.
without any further info regarding the state of your server, that is all i 
can suggest for now.

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