When trying to launch a Remote Desktop Protocol (RDP) session from the website https://esri.example.com, the RDP session will fail automatically after the user enters their credentials.

As the service offered by this website uses a nonstandard protocol over port 443, the HTTPS proxy service will fail to interpret the transaction properly.

To overcome this limitation on a transparent proxy:

• In the ProxySG Management Console, go to Configuration -> Services -> Proxy Services
• Click New Service
• Set the proxy service to TCP tunnel
• In the listeners section, click add and enter the IP for this host, x.x.x.x as the destination and set the port as 443
• Click Ok, ok and Apply to save the new service.

To overcome this limitation on an explicit proxy:

• In the ProxySG Management Console, go to Policy > Policy Files
• To the right of 'Install Local File From' select 'text editor' and click install
• Enter the following policy:

<proxy>
url.host.exact=x.x.x.x detect_protocol(no)

• Click install to apply the above policy to user traffic

The above solution will also apply to similar issues with other hosts offering nonstandard HTTPS services such as RDP or VNC.