Your server session has expired

Hi,

I have upgraded my Domino Server from version 7.0.1 to Release 8.5. Everything is working fine but one of user having problem with web access, his session is expiring sometime after one minute, sometime after two minutes and sometime even after few seconds with the following message on the top of login screen;

Your server session has expired. Once you have reauthenticated, the action you just requested will be automatically reattempted. To go back without reauthentication, click here

And everytime he needs to write user name and password to login back. If he clicks on “click here” then it goes back to inbox but again appears the same message when he tries to open any email.

SSO is not enabled.

Regards,