Veritas Netbackup 5.1

Need guidance on how to check / troubleshoot and solve this problem. 

I trigger a backup and it shows :

- started process bpbrm (pid=13602)
- connecting
- connected; connect time 0:00:00

Then that's it. Sometimes it goes from Connecting to Mounting but nothing 
happens. No data written.   
Wait for hours and finally I need to kill the job and it end with error code 
150.
 
Please advice.   ^_^ Thanks in advance. 

*Netbackup newbie*

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