Troubleshooting Tip: Unable to take RDP of machines via SSL VPN web portal
Description
This article describes how to handle a scenario where users are unable to connect to the server via RDP through the SSL VPN web portal.
Scope
FortiGate.
Solution
When users are connected via SSL VPN through the web portal and process the following actions, it will show a 'connect closed' error.
Select the quick connection, select the RDP, specify the server IP address, and select launch with the default security menu 'standard RDP encryption security'.
If the error pops up after using the above settings, make sure settings are available on the RDP device itself.
To check the settings, navigate to Start -> Settings -> System -> Remote Desktop -> Advanced settings, and verify the settings. In the below screenshot, it can seen that the PC has been set to Network Level Authentication.
Navigate to the SSL VPN web portal, select the security menu with Network level authentication as shown in the image below, and then select Launch. A prompt for server login will appear. After entering the credentials, it will be possible to connect to the server via RDP successfully.
Note: If setting the Security type to Network Level Authentication does not work, try 'Allow the server to choose the type of security'.