Please help me with the login problems where we have a JBOSS 4.0 running for over a year, some of users started having the following problem.

2009-10-28 08:46:17,446 INFO [STDOUT] 08:46:17,446 WARN [LoggerListener] Authentication event AuthenticationFailureCredentialsExpiredEvent: poingo@sdxi.com; details: org.acegisecurity.ui.WebAuthenticationDetails@fffc7f0c: RemoteIpAddress: 98.253.37.178; SessionId: 40175DFC7E87A009448191E226764E39; exception: User credentials have expired

Newly created users are fine.

Thank you for your help.
William