ERR_USRFAIL: User authorization failed

2013-04-24 10:26:09       3780 INF          1 DBMSrvCo A DBM Server client connection was established at 2013-04-24 10:26:09 (client process has process ID 3512 on computer lpbsp0015.company.com).

2013-04-24 10:26:09       3780 INF        421 DBMSrv   Command 'user_getchallenge ...' was executed since 2013-04-24 10:26:09.

2013-04-24 10:26:09       3780 ERR     -24580 DBMSrv   ERR_COMMAND_FAILED: Command 'user_getchallenge' has ended and failed with return code -24950.

                          3780 ERR     -24950 DBMSrv   ERR_USRFAIL: User authorization failed

2013-04-24 10:26:09       3780 INF          2 DBMSrvCo A DBM Server client connection was released (client process has process ID 3512 on computer lpbsp0015.company.com).

Anyone know why this is happening?

Regards,

AD