WAF plus SSL VPN plus Userportal on Port 443
Sophos UTM already uses OpenVPN port sharing if the userportal uses the same port als SSL VPN. But I can't use SSL VPN on port 443, too.
Basically it should be possible to use OpenVPN port sharing with the web application firewall instead of the user portal.
In the WAP it should be possible to define a virtual web server that points to the userportal.