In my case this was occurred only one time as there was no communication or connection between the EMM as well as NBU4 host. What you have to do is post a output of below command on the Symantec site.
Code:
<install path>\verits\netbackup\bin\admincmd#nbemmcmd -getemmserver
If NBU4 exposed offline during over command in that case verify connectivity among master & NBU4 (situate FQDN within to host file). If all fails in that case get rid of NBU from NBU4 and re-install it over again. I expect lastly it will work
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