In this case, the QDS is outside the DMZ, the monitored SQL Server is inside the DMZ.
Status button in Spotlight Console shows: The RPC server is unavailable. (Exception from HRESULT: 0x800706BA
There can be a few reasons for this error:
In addition to ensuring the correct ports are open per the firewall considerations document:
The RPC server is unavailable. (Exception from HRESULT: 0x800706BA) error may occur when connecting to a remote computer. There can be a few reasons for this error:
1. The remote computer is blocked by the firewall.
Solution: Open the Group Policy Object Editor snap-in (gpedit.msc) to edit the Group Policy object (GPO) that is used to manage Windows Firewall settings in your organization.
Open Computer Configuration, open Administrative Templates, open Network, open Network Connections, open Windows Firewall, and then open either Domain Profile or Standard Profile, depending on which profile you want to configure.
Enable the following exception: Allow Remote Administration Exception and Allow File and Printer Sharing Exception.
2. Host name or IP address is wrong or the remote computer is shutdown.
Solution: Verify correct host name or IP address.
3. The TCP/IP NetBIOS Helper service isnt running.
Solution: Verity that TCP/IP NetBIOS Helper is running and set to auto start after restart.
4. The Remote Procedure Call (RPC) service is not running on the remote computer.
Solution: Verity that Remote Procedure Call (RPC) is running and set to auto start after restart.
5. The Windows Management Instrumentation service is not running on the remote computer.
Solution: Verity that Windows Management Instrumentation is running and set to auto start after restart.
6.
Please check the following Microsoft article here
Be sure TCP/IP NetBIOS Helper and Remote Procedure Call (RPC) services both running on the monitored machine , restart the DS machine (if possible) to break existing network connections.
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