Why Does RDP Over an SSH Tunnel Not Work on ZyWALL Devices?

Zyxel_Stanley

Question:
Why does RDP fail to connect when using an SSH tunnel on a ZyWALL device, even though the same RDP connection works through an IPsec VPN?

Answer:
On ZyWALL devices, the SSH service no longer supports TCP Forwarding due to security considerations. This feature has been disabled to prevent potential vulnerabilities, which means SSH tunneling for RDP is no longer available.

To access an RDP server securely, it is recommended to use SSL VPN or IKEv2 VPN instead. Both methods are fully supported and provide secure remote access.