Adprep /forestprep error

[adrin]

We had a Windows Server with AD Domain Controller. Due to some unknown reason, domain started giving us problems due to which I needed to remove it using "medadata cleanup". Another problem occurred is when I try to run adprep /forestprep, it gives me the following error message:

Adprep encountered an LDAP error.
Error code: 0x20. Server extended error code: 0x208d, Server error message:
0000
208D: NameErr: DSID-031001BD, problem 2001 (NO_OBJECT), data 0, best match of:
'CN=DALSRV1\
DEL:1f1b163e-6f03-4bcf-b5ac-5ec5c8e7ca34,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=testme,DC=com'

Any idea what is it and how can I get rid of it? Thanks for all your helps.

[Flynnl]

Firs of all I’m not able to understand your problem. Can you just clarify whether the problem is with your first DC/Domain which you cleanup in AD or are you talking about some another machine? Until you reply, just remember that in case you have done a metadata cleanup then don’t reconnect the removed machine to the domain.

If you will remove AD from it then try running dcpromo /forceremoval to demote it without any network connection.

[prash_mate]

Even I have a small confusion like if you have lost your DC then what was the need to run adprep on your domain. Anyway, what you can do now is better run a diagnostics against your Active Directory domain. Furthermore, you should try running dcdiag, netdiag and repadminin verbose mode such as:

• DCDIAG /V /C /D /E /s:yourdcname > c:\dcdiag.log
• netdiag.exe /v > c:\netdiag.log (On each dc)
• repadmin.exe /showrepl dc* /verbose /all /intersite > c:\repl.txt
• dnslint /ad /s "ip address of your dc

[Lyalisai]

Hello adrin, can you just tell me whether your existing one is DNS/GC and holder of the 5 FSMO roles?

[adrin]

Still there are problems. Whenever i'm running those diagnostics and repadmin /showrepls commands it shows the old server (DALSRV1) as "Inbound Neighbor s". I have tried everything what you guys suggested as well as some more procedures from web but none of them have worked for me. Somebody please help.

[Brandy]

Dont worry Adrin. You need this:

How to remove completely orphaned Domain Controller:
http://support.microsoft.com/kb/555846/en-us