The kerberos client received a KRB_AP_ERR_MODIFIED error from the server host/server1.datastream.local.  The target name used was DATASTREAM\SERVER1$. This indicates that the password used to encrypt the kerberos service ticket is different than that on the target server. Commonly, this is due to identically named  machine accounts in the target realm (DATASTREAM.LOCAL), and the client realm.   Please contact your system administrator.