What does the error 'The message has expired' mean and how is it resolved?

Question

Complete error message:

Error calling Web Service '.Common Event Model': java.lang.Exception:
Http Status: 500 Internal Server Error

----------fault message begin----------
Fault Code: ns1:MessageExpired
Fault String: The message has expired (WSSecurityEngine: Invalid timestamp The security semantics of the message have expired)

This error can occur on any web service call not only the CEM.

Answer 1

This error means that the system time on the server accessed by the web service call is more than 5 minutes faster or slower than the calling system.  Each message sent by the client contains a time-stamp. The server refuses messages sent more than five minutes ago. To resolve this error change the system time on 1 of the servers so they match.