MSDP storage server may go down in a multi-domain scenario if the same user is used by two or more NetBackup domain
When two domains access the same MSDP storage server using the same user id, the storage server rejects the request. In such a situation, the storage server appears as down.
(4139218)
Workaround:
Run following NetBackup Deduplication Shell command to restart MSDP service:
dedupe MSDP stop dedupe MSDP start
For more details, refer to the NetBackup Deduplication Guide on SORT.