SM 9.41 Web Client login error "You have been logged out due to session timeout" error

Hi,

SM version: 9.41

Browser: IE 11

The web client has been working fine till one day, no users can login via browser. The moment the user hits the "Log In" button, the system logs in and then immediately returns back to the login page with error "You have been logged out due to session timeout".

However, these users have no issue logging in via windows client. We tried rebooting the entire web and app server, deleting browser cookies and doesnt help ro clear the problem.

Did anyone encounter this before? Is there any caching in the sm tables that prevent the users from logging via web client?

Many thanks in advance!