If the user's computer has the wrong time or the wrong time zone and is more than an hour apart, you may get an error that says: Login failed, please contact support. Error: exp is in the past:XXXXXXXX
To check if the time on the computer matches the time used by the server, check the following link: https://ws1.storegate.com/datetime.aspx
The action will be to change the time on the user's system.