KB 2353 - Cannot resolve . Please add appropriate DNS to ScaleArc network settings. Click here to go ScaleArc network settings page

User receives the following error message while trying to create an AlwaysOn cluster:

Error ID 2353: Cannot resolve . Please add appropriate DNS to ScaleArc network settings. Click here to go ScaleArc network settings page.

ScaleArc runs several queries against the VNN server to discover the configuration options for Availability Groups within the Always-On setup. One of these queries is: select * from sys.dm_hadr_instance_node_map. This query can have an empty result set if there are any orphaned (deleted) Availability Groups listing within the registry on the server that is currently running the VNN. (Although all members of the AG should be checked for the same registry entry.)

As a solution clear the registry by following the steps below:

1. Launch regedit on the SQL Server.
2. Browse to HKEY_LOCAL_MACHING\CLUSTER\HadrAgNameToldMap
3. Backup the registry key
4. Remove any orphaned records
5. Then verify that running the query select * from sys.dm_hadr_instance_node_map returns results.
6. If rows returned exceed 0 please recreate the cluster within ScaleArc. 

This error may also occur when the DNS server specified on ScaleArc is unreachable. Please specify a valid instance name/ port of the database server and try connecting again.

For more information and troubleshooting guidelines for this issue, please refer to the KB article by ScaleArc Support Team: Creating Clusters in ScaleArc for MSSQL 3.1

If the problem persists please contact ScaleArc customer support at scalearc-support@devgraph.com. 

If you are experiencing issues with ScaleArc or with any of its features, please contact ScaleArc Support.

We are available 24x7 by phone at +1 972-588-4221.  For general support inquiries, you can also e-mail us at scalearc-support@devgraph.com.