Symantec Vault Keeps asking for login credentials

Hi,

Symantec Server 9.0 is hosted in Munich

Symantec client 9.0.3 addin is installed on our machines in India and UK.

We often get issues where the Vault keeps asking users to enter a user name and password and only after changing the login password and logging off, does the issue get resolved. If this was an issue with the AD password expiry, then why is that the user can still access the Outlook client and all shared drives without being asked for user credentials. 

Could someone please come back to me on this. 

 

Many thanks, 

Rakesh S.