Sorry to know that issue vanished and appeared again...Please take a look at daemon.raw file under storage node @ C:\Program Files\EMC NetWorker\nsr\logs...share it if possible.
Why are you still on 8.1.x as it is out of support now. Recommend you to upgrade it to a supported version as soon as you come out of this issue.
Thanks so much for you my problem is fixed
And I marked your answer as correct answer
So you advise me to upgrade the networker version right for clients and server if I do this I will not cause any problem My NSR server OS is 2008 but my client is 2012
If you give upgrade steps I appreciate it
Please take a look at this document which has step by step procedure to perform upgrade.
You can also reach out to Dell EMC if you are not comfortable doing this on your own as it has multiple step which involves good knowledge on NetWorker and migration process. They will provide you upgrade PS service which will get your NetWorker on the latest supported version with utmost ease and precision.
Happy that I was able to help....and Win 2008 as server OS should not be a problem as it is very much supported.
Suraj S. Pujari