we have installed ACS 18.104.22.168 Patch5 on Windows Server 2003 SP1 Domain Controller. Authetication to local AD works fine. Now we tried authetication to Trusted Domains and get Error 1213,20498 in csauth.log. Netbios over TCPIP is enabled on all Servers. External DB's and Group Mapping is configured. Can we more debug csauth.exe to find the isssue ? Service Logging is full. Thanks for Help.