Sql – Cannot connect to sql server from vpn client

NOTE: FlushIpNetTable failed on interface [22] {88C21B16-3D85-4B9C-A65F-10F89A2DEACB} (status=5) : Access is denied.  
C:\WINDOWS\system32\route.exe ADD 208.111.39.186 MASK 255.255.255.255 192.168.11.1
ROUTE: route addition failed using CreateIpForwardEntry: Access is denied.   [status=5 if_index=11]
Route addition via IPAPI failed [adaptive]
Route addition fallback to route.exe
The requested operation requires elevation.

Firstly, you should run OpenVPN as Administrator:

Secondly, add the following to the client config file:

route-method exe
route-delay 2

Turns out the clients can connect and routing is fine, but the client was being quarantined by NPS (Network Policy Server). Originally I had installed NPS and then uninstalled it during troubleshooting. Only when reinstalling it do I see the RRAS logs mentioning that the client has been quarantined. The client had the 'VPN Non-NAP Capable' status and the policy with regards to that status was to provide limited network access, not full network access. I changed the policy and it's working now.

Another issue might have been my subnet mask. IP addresses beyond .127 would not be able to communicate with IP's below .128 due to the subnet mask 255.255.255.128 even though the subnet (192.168.0.*) and subnet mask (255.255.255.128) were the same.