One of the most common configuration issues customers encounter is availability group listener creation. When creating an availability group listener in SQL Server, you might encounter the following messages:
Msg 19471, Level 16, State 0, Line 2
The WSFC cluster could not bring the Network Name resource with DNS name '<DNS name>' online. The DNS name may have been taken or have a conflict with existing name services, or the WSFC cluster service may not be running or may be inaccessible. Use a different DNS name to resolve name conflicts, or check the WSFC cluster log for more information.
When using SQL Server Management Studio to add the listener to an existing availability group, these errors may appear in a dialog box:
The majority of time, listener creation failure resulting in the messages above are due to a lack of permissions for the Cluster Name Object (CNO) in Active Directory to create and read the listener computer object.
The CNO is the Windows Cluster computer object itself. If you created your Windows Cluster and named it AGCluster - it would appear in Failover Cluster Manager. This is your CNO:
In order to confirm that a lack of CNO permissions is responsible for listener creation failure, launch Powershell with elevated privileges and generate the cluster log on the node hosting the availability group primary replica, where you failed to create the listener:
Open the cluster log using Notepad. Here are examples of errors raised due to the CNO lack of permissions, when attempting to create the listener. Some important information these errors tell us:
1 The domain controller where those permissions are being checked. In the below examples, it is in domain 'AGDC.' Therefore, when modifying the permissions in Active Directory be sure it is done in that DC.
2 The container that the listener is being created in. In the below examples, it is the Computers container. This is important - you need to know the container in Active Directory to assign the CNO permissions on.
00000be0.00001a4c::2014/03/18-15:32:06.068 INFO [RES] Network Name <ag_aglisten>: Using domain controller\DC.AGDC.COM.
00000be0.00001a4c::2014/03/18-15:32:06.237 INFO [RES] Network Name <ag_aglisten>: Failed to find a computer account for aglisten. Attempting to create one on DC \DC.AGDC.COM .
00000be0.00001a4c::2014/03/18-15:32:06.237 INFO [RES] Network Name <ag_aglisten>: Trying NetUserAdd() to create computer account aglisten on DC \DC.AGDC.COM in default Computers container
00000be0.00001a4c::2014/03/18-15:32:06.295 ERR [RES] Network Name <ag_aglisten>: Unable to create computer account aglisten on DC \ \DC.AGDC.COM, in default Computers container, status 5
000004f8.00002154::2014/03/18-15:32:06.491 INFO [RCM] rcm::RcmGum::SetDependencies(ag_aglisten)
00000be0.00001a4c::2014/03/18-15:32:06.492 ERR [RHS] Online for resource ag_aglisten failed.
0000125c.00000f0c::2014/01/14-21:48:31.533 ERR [RES] Network Name: [NNLIB] Binding to DC \\DC.AGDC.COM (domain AGDC.COM) failed, status 5.
0000125c.00000f0c::2014/01/14-21:48:31.533 INFO [RES] Network Name <ag_aglisten>: AccountAD: End of Slow Operation, state: Initializing/Writing, prevWorkState: Writing
0000125c.00000f0c::2014/01/14-21:48:31.533 WARN [RES] Network Name <ag_aglisten>: AccountAD: Slow operation has exception ERROR_ACCESS_DENIED(5)' because of 'status'
0000125c.00000f0c::2014/01/14-21:48:31.533 INFO [RES] Network Name: Agent: OnInitializeReply, Failure on (2a487cec-66af-4ea6-92d4-95bc70f082a4,AccountAD): 5
Grant the permissions "Read all properties" and "Create Computer objects" to the CNO via the container. Here's an example of granting the required permissions for demonstration purposes:
1. Open the Active Directory Users and Computers Snap-in (dsa.msc).
2. Locate the “Computers” container or the container that the listener is being created in, this is assuming that this is the container where the listener computer object creation is being attempted.
3. Right-click View and select "Advanced Features."
4. Right-click the Computers container and choose Properties.
5. Click the Add button and enter the cluster named object (CNO). In this example, it is agcluster$. Click the Object Types button, check 'Computers' and click Ok and then Ok again.
6. Back in the Properties dialog, click the Advanced button and the "Advanced Security Settings for SQL" dialog should appear.
7. Click the Add button. Select "Read all properties" and "Create Computer objects." Click OK until you're back to the Active Directory Users and Computer window.
8. Attempt to recreate the listener.
This option is useful in situations where the domain administrator does not allow the CNO “Read All Properties” and “Create computer Objects” permissions:
1. Ensure that you are logged in as a user that has permissions to create computer objects in the domain.
2. Open the Active Directory Users and Computers Snap-in (dsa.msc).
3. Right-click View and select "Advanced Features."
4. Right click the OU/Container you want the VCO to reside in and click “New” -> “Computer.” In the example below, we are creating the listener object in the Computers container.
5. Provide a name for the object (this will be your listener name) and click “OK."
6. Right click the VCO you just created and select “Properties”. Click the Security tab.
7. Under Security tab, click the Add button. Enter the cluster named object (CNO). In this example, it is agcluster$. Click the Object Types button. Select Computers and click Ok.
8. Highlight the CNO, check the following permissions, and click “OK” (alternatively, choose Full Control)
Allowed To Authenticate
Validate write To DNS Host Name
Validate Write To Service Principle Name
Read Account Restrictions
Write Account Restrictions
Read DNS Host Name Attributes
Read Personal Information
Read Public Information
9. Attempt to create the availability group listener.
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