Hi !

We had the same problem in the last 6 month with this DATAZONE : Networker 
7.3.3B510 (under aix) with MICROSOFT clients.

We had noticed that all DATAZONE hanged when we lauched backup from client 
MICROSOFT with commands like "save" initiated by client. 
When backup launched with commands like "savegrp" from server, it didn't 
hanged the DATAZONE.
 
In this context hanged, the only method to recover the fonctionality of 
DATAZONE is restart DATAZONE (/etc/rc.networker stop;(/etc/rc.networker 
start).

We tried to solve the problem and we found tips to solve :
=> Reverse and DNS entries were not used correctly (differences of 
interpretation between server networker and its clients)
=> Too many backup of databases index (too many groups) and bootstraps (not 
scheduled in our environment by networker schedule).

We had corrected these things and now its works well !

I hope this could be help you, try to look if your DNS request or name 
resolutions works properly.

Best Regards,

David

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