Symptom:
Users are all denied access to DI and instead are presented with the page di/login/error.jsp which says:
The digest and timestamp from SAFE do not tally with info in this server, there are three reasons this might happen.
• SAFE authentication is not configured correctly on this application server
• The clock in this server disagrees by some margin with the clock in the SAFE server
• You are a chancer trying your luck
Whatever the reason, the response is the same: "COMPUTER SAYS NO".