ソリューションは必要ありません (情報共有のみ)
Initiated a windows restoration after changing the hostname and encountered the "Error:Restore not initiated:operation requested by an invalid server(37)".
Chnaged the Hostname( replaced the old hostname with new hostname) in the below registry resolved the issue.
HKEY_CURRENT_USER\SOFTWARE\VERITAS\NetBackup\NetBackup Client\<Username>\Settings\LastDestClient