We recently made modifications to our DNS server infrastructure, and as a result, encountered issues when connected via VPN. Specifically, the performance of Active Directory administration tools significantly slowed down when accessed over a VPN connection. This problem happens when the split tunnel is active and a DNS setting change occurs on the physical adapter, which is what happened in our case.
To address this issue, follow these steps:
Open the registry editor (regedit) and navigate to the following registry key:
Copy code
HKEY_LOCAL_MACHINE | Software | Policies | Microsoft | Windows NT | DNSClient
In the right pane, create a new REG_DWORD key named DisableSmartNameResolution with the value set to 1.
Restart your machine, and the Active Directory tools should return to normal functionality.
If you prefer not to modify registry settings, there is an alternative solution. Create a shortcut for each Active Directory tool with the following variable:
%SystemRoot%\system32\dsa.msc /server=192.100.x.y
The example above refers to the AD Users and Computers tool.
I hope this information is helpful. Comments are welcome.