Adprep /forestprep error

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:

Quote:

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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'

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

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.

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

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

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.

Dont worry Adrin. You need this:

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