Hi
We have just one AD domain which contains two domain controllers (2008 + 2012 R2) and two member servers along with 35 clients. Domain and forest functional level is set to 2008.
Both DC's host Active Directory integrated DNS. The 2008 DC also hosts DHCP, the DFS service and all FSMO roles.
For several weeks I have seen 1655 + 1126 event pairs being logged once an hour on the 2008 DC (Phobos), complaining the Global Catalog (GC) cannot be contacted. The events comprise:
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1655:
Active Directory Domain Services attempted to communicate with the following global catalog and the attempts were unsuccessful.
Global catalog:
\\Phobos.htlincs.local
The operation in progress might be unable to continue. Active Directory Domain Services will use the domain controller locator to try to find an available global catalog server.
Additional Data
Error value:
1722 The RPC server is unavailable.
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1726:
Active Directory Domain Services was unable to establish a connection with the global catalog.
Additional Data
Error value:
8430 The directory service encountered an internal failure.
Internal ID:
3200ce6
User Action:
Make sure a global catalog is available in the forest, and is reachable from this domain controller. You may use the nltest utility to diagnose this problem.
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The events are not being logged by the other DC.
I have used LDP and nltest as described in this MS article. Both utilities show the GC is available when connecting to Phobos from Phobos.
I have run DCDiag and the only failure is for NcSecDesc which according to this MS article can be safely ignored (we don't use a RODC).
Everything seems fine. Staff can log on, access resources etc.
A Google search shows that this can sometimes be caused by DNS issues, but DNS seems to be OK. The 2008 server is configured to use 127.0.0.1 first followed by the IP address of the second DNS server in the DNS server set up for IPv4.
Does anyone have any ideas what may be causing this, please?
Thanks.
We have just one AD domain which contains two domain controllers (2008 + 2012 R2) and two member servers along with 35 clients. Domain and forest functional level is set to 2008.
Both DC's host Active Directory integrated DNS. The 2008 DC also hosts DHCP, the DFS service and all FSMO roles.
For several weeks I have seen 1655 + 1126 event pairs being logged once an hour on the 2008 DC (Phobos), complaining the Global Catalog (GC) cannot be contacted. The events comprise:
-----------------------------------------------------------------------------------------------------------------------------
1655:
Active Directory Domain Services attempted to communicate with the following global catalog and the attempts were unsuccessful.
Global catalog:
\\Phobos.htlincs.local
The operation in progress might be unable to continue. Active Directory Domain Services will use the domain controller locator to try to find an available global catalog server.
Additional Data
Error value:
1722 The RPC server is unavailable.
-----------------------------------------------------------------------------------------------------------------------------
1726:
Active Directory Domain Services was unable to establish a connection with the global catalog.
Additional Data
Error value:
8430 The directory service encountered an internal failure.
Internal ID:
3200ce6
User Action:
Make sure a global catalog is available in the forest, and is reachable from this domain controller. You may use the nltest utility to diagnose this problem.
-----------------------------------------------------------------------------------------------------------------------------
The events are not being logged by the other DC.
I have used LDP and nltest as described in this MS article. Both utilities show the GC is available when connecting to Phobos from Phobos.
I have run DCDiag and the only failure is for NcSecDesc which according to this MS article can be safely ignored (we don't use a RODC).
Everything seems fine. Staff can log on, access resources etc.
A Google search shows that this can sometimes be caused by DNS issues, but DNS seems to be OK. The 2008 server is configured to use 127.0.0.1 first followed by the IP address of the second DNS server in the DNS server set up for IPv4.
Does anyone have any ideas what may be causing this, please?
Thanks.