- You are using an RDS gateway on a Windows 2016 server
- The connection to the RDS gateway randomly fails depending on the extension with the RDC client
- The update kb4493470 is installed on the server.
On the server uninstall the bet kb4493470.
Install the update kb4493473 which solves the problem.
To install it I had to go find it on the site catalog update from Microsoft.