Could you confirm
setup:
you have a dynamic ISP provided IP and connect to VPN provider 81.17.24.10
VPN provider assigns static ip to your router.
Internal server is on 192.168.133.254
Goal:
You want to connect to your webserver via public wan network, thru the vpn, back to the internal server?
Questions:
This ip you get assigned by the vpn provider, is it
- what is your local gateway ip
- routing table of the router
Possible sollution:
It looks like your router handels the vpn as a lan (not wan) interface. So traffic to the VPN ip is directed to you lan interface, which sounds quite correct that you get your router web gui.
I think the only thing you remain to do is forward port 80 (and optionally 443) the the internal address of server using nat/portforwarding. This schould be configurable tru the webgui.