You receive the error “Your OfficeScan session has timed out” when you try to login to your Office Scan server  via web console.

It usually happens if IUSR_computername has no permissions on TEMP Folder

To fix it navigate to

%Program Files%Trend MicroOfficeScanPCCSRV
Right click on Tempadd the user IUSR_computername from your local computerand grant him full control permission.