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downtime

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Posts: 103
Reply with quote  #1 
Dear all,

I am having issues with a new RODC I installed at a remote site. It seems to have issues communicating with a particular writable DC. For example, when I try to open 'Active Directory Users & Computers' on the RODC and point it to this writable DC (lets call it DC1) it says:

The Following Domain Controller could not be contacted: DC1
The Directory Service is unavailable.

From the RODC I can ping DC1 by IP and hostname successfully.

From DC1 I can ping the RODC by IP and hostname successfully.

From DC1 the event logs are clean. No errors at all. I have also run the following on DC1 with no errors:

dcdiag /s: DC1
dcdiag /test:advertising
dcdiag /test:checksdrefdom
dcdiag /test: dns
dcdiag /test:sysvolcheck
dcdiag /test:ridmanager

repadmin /showrepl *

This command is successful for the other writable DCs but I get the following error when it tries to connect to the RODC:

Repadmin: running command /showrepl against read-only DC RODC1.MYDOMAIN.INT
[d:\longhorn\ds\ds\src\util\repadmin\repbind.c, 444] LDAP error 81 (Server Down) Win32 Err 58.

From the RODC the event logs are clean. No errors at all. I have also run the same DCDIAG commands with no errors except for:

repadmin /showrepl *

Repadmin: running command /showrepl against full DC DC1.MYDOMAIN.INT
LDAP error 52 (Unavailable) Win32 Err 55.

Any ideas what the root cause is?
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donoli

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Reply with quote  #2 
https://social.technet.microsoft.com/Forums/windows/en-US/780ee678-e472-4cfb-bff3-785623e08fb1/replication-error-ldap-error-52-unavailable-win32-err-55-ldap-error-81-server-down-win32-err-58?forum=winserver8gen
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wobble_wobble

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Posts: 832
Reply with quote  #3 
IIRC RODC' s only talk with 1 DC
What are you using the RODC for?
Is that app or any LDAP queries working?
Any errors on the RODC event log?

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downtime

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Posts: 103
Reply with quote  #4 
The Event Logs on the RODC are completely clean, no errors at all.

From my PC I can BIND to DC1 (writable DC) and RODC successfully:

C:\Windows\system32>repadmin /bind DC1
Bind to DC1 succeeded.
NTDSAPI V1 BindState, printing extended members.
bindAddr: DC1

C:\Windows\system32>repadmin /bind RODC1
Bind to RODC1 succeeded.
NTDSAPI V1 BindState, printing extended members.
bindAddr: RODC1
Extensions supported (cb=52):

From the RODC I can BIND it itself + all other writable DCs OK except for DC1:

C:\Windows\system32>repadmin /bind DC1
Repadmin can't connect to a "home server", because of the following error. Try
specifying a different
home server with /homeserver:[dns name]
Error: An LDAP lookup operation failed with the following error:

LDAP Error 52(0x34): Unavailable
Server Win32 Error 0(0x0):
Extended Information:

The RODC is in a site connected via Internet VPN. The connectivity is very stable and ICMP response is excellent (<20ms).

When I look in AD Sites & Services, under the RODC I can see 1 Connection to a writable DC called "RODC Connection (SYSVOL)". Should there be any more?
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downtime

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Posts: 103
Reply with quote  #5 
Update!

I tested the bind command again on the RODC and now everything is OK.

I checked the Event Logs on the RODC and I have this very interesting recent event:

"The File Replication Service is no longer preventing Domain Controller RODC1 from becoming a Domain Controller."

Why would it take over 2 days "to fix itself" when everything else appeared to be working? Very strange.
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wkasdo

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Posts: 197
Reply with quote  #6 
Network error. FRS will not start until it syncs with a direct replication partner. Matches all the symptoms [smile]
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