netbackup cannot connect on socket error

I am getting this error when I got clients and "connect' or "properties" I get "cannot connect on socket " I can connect to the server that has the netbackup server running on it , I am guessing the first thing would be to restart the sevices on the client or reboot , and then check to see if the ports are open for comuunitcation , anything else ?
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If you have upgraded the clients you cant connect to, to a version higher than you backup server this will cause that to happen and will having the wrong master server name on the clients. if you have reinstalled or moved the master server to a new box with a different name they wont connect.

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NAMEWITHELD12Author Commented:
thanks , I will check this out when i get to work , I have no access from  here ,
thanks again for the reply
Rodney BarnhardtServer AdministratorCommented:
I have seen this before and restarting the system with the issue usually resolves the problem if there have been no changes to the configurations. Otherwise,  you need to document any recent changes with your question.
NAMEWITHELD12Author Commented:
Yeah ! all of your solutions are acurate but the issue was the netbackup was not active for 3 years and many of the clients did not exist or did not have the agent !!!!   simple issue but i was unable to check at the time THANKS !!!!!
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