Hello,
Is there a firewall involved, if so, have you updated info on it, i.e 
rules and filters.
Have you double checked the backup servers IP properties and DNS setup to 
verify if the new Domian is in the name resolution list ?
Do you have addtional DNS servers in new domain that may need to be added 
to server ip config ?
I assume you have already checked the servers file on the client and or re-
installed the Networker client software.

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