Help!  Please!  Yesterday users started having issues logging into Sage CRM.  It was not all the users, only some of them.  It seemed that 1/2 could and 1/2 could not.  Below is the message that they were getting.

Today, many of the users that could not get in yesterday, are reporting that they can get in today.  However, some users that could get in yesterday, are reporting that they could get in yesterday.  However, they cannot today.  They are getting the same message as above.

Any idea what might be causing this?  Any assistance would be greatly appreciated.  Thanks!