If you are connecting to a site by OpenVPN and unable to access network resources, this is typically one of two issues. If you are trying to access by hostname, you may not be getting DNS resolution over the tunnel. This is set on the Untangle server at Apps > OpenVPN > Server > Groups. Click on the Edit button for the group the user is assigned to and you can see the DNS settings there.
If you are trying to access by IP address and are unable to, make sure that the subnet the IP address is in is exported at Apps > OpenVPN > Server > Exported Networks. Enter the subnet there in CIDR notation.Follow