During upgrade form version 10 to 11 at the first reboot enterprise vault runs the dll registration process but some time it failed to start registration , these behavior is especially identified in tightly hardened servers.

Error :-

An error occurred in the thread control of enterprise vualt .net server processes

Reference :- LSM/CCI

additional info: KVS.enterprise vault. systemServer Manager

Because of above mention scenario , lot of .net related error was reported in event logs and I was failed to start storage service too. However database upgrade was completed successfully as it required directory and indexing service to start

Steps -1 :- I tried below steps but doesn’t resolve issue

1) Stop the EV services

2) Open a command prompt on the EV Server and ‘Run as Administrator’.

3) “C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe” /tlb /codebase /verbose “C:\Program Files (x86)\Enterprise Vault\KVS.EnterpriseVault.ServerManager.dll”

Steps -2 :-  below option also doesn’t help full

1. Run fileReRegister.bat from enterprise vault installation directory

Steps -3 :- final and permanent solution

1. Stop enterprise vault service
2. https://www.veritas.com/support/en_US/article.000019448
3. Download the FileReRegister.log
4. Start the enterprise vault service