IPP - The User is marked Obsolete

Hi everybody,

we have an LC 8 Update 1 Server up and running. We're synchronizing the users with AD. Finally we have installed an IPP Printer what worked in the beginning. After a few days we got the following error:

2009-01-15 07:48:40,653 WARN [com.adobe.idp.common.errors.exception.IDPLoggedException]
UserM:GENERIC_WARNING: [Thread Hashcode: 29724544] | [AuthenticationManagerBean] errorCode:12803 errorCodeHEX:0x3203 message: The user is marked as Obsolete

2009-01-15 07:48:40,731 WARN
[com.adobe.idp.um.businesslogic.authentication.AuthenticationManagerBean]
UserM:GENERIC_WARNING: [Thread Hashcode: 29724544] Authentication failed for user [test.user] (Error code - 12803 [0x3203]) as none of the AuthProviders can authenticatethe user. Refer to debug level logs of category com.adobe.idp.common.errors.exception for more details.

2009-01-15 07:48:40,731 ERROR
[com.adobe.ipp.umclient.IPPAuthenticationManager]
ALC-PDG-006-016-User authentication failed.

We could not find a single article concerning one of the above error codes.
Any Ideas?

kind regards
Michael