[Wand3r3r]

firmware wizard?

A preshared key concerns wireless encryption and is not related to a firmware update. You would never ever do a firmware update via wireless unless you like to turn the router into a boat anchor.

"various vpn tunnels" You configured the server as a vpn server? You only need to foward port 1723 to the static ip of your server for the vpn access. GRE can't be blocked by the router which is a ip protocol not a port.

 

[Wand3r3r]

you write "ports". did you mean port?

error 800 indicates you were not able to make a vpn connection

if you hook a laptop to the routers lan can you establish a vpn connection to the server? if not the server is not configured correctly

did you set a static ip on the server? Is it what is listed for the port forward in the router?