Thus, the SSL VPN tunnel gets established between SSL VPN gateway and John's machine. The key point here is that the SSL tunnel exists only upto the SSL VPN gateway and not up to Application Server. While this mechanism works well for Web traffic, different SSL VPN vendors have used different approaches of implementation for non-web traffic.

Jan 21, 2015 Port Forwarding TCP port 443 on DrayTek SSL VPN Routers SSL VPN Port. Go to [SSL VPN] > [General Setup], set the Port setting from its default of 443 to another port, in this example, the port has been changed to 444. Changing this setting does not require restarting the router and will take effect after clicking OK on this page. How to change SSTP port Jul 28, 2017 SSL VPN Client for Windows - SophosLabs Analysis

Jan 21, 2015

SoftEther VPN - Wikipedia

To change the SSL VPN port - web-based manager. 1. If Current VDOM appears at the bottom left of the screen, select Global from the list of VDOMs. 2. Go to VPN> SSL> Config. 3. Type an unused port number inLogin Port, and select Apply. To change the SSL VPN port - CLI. This is a global setting.

SSL VPN Client for Windows - SophosLabs Analysis