enable the DMZ option as a last resort. If you are having trouble using
an application from a computer behind the router, first try opening
ports associated with the application in the Virtual Server or Port
Make sure VPN passthrough is enabled if you are trying to use a VPN client from behind the router.
VPN Passthrough will only function if the VPN client being used runs on
the standards ports associated with the VPN connection type. If you are
having problems getting your VPN client connected from behind the
router and these VPN passthrough options are enabled, please contact
your network administrator to find out if any nonstandard ports or
options are being used.