6.5 session closes read beyond eof

Using the screenconnect app for Windows 10.  Client is running 6.5.  I can see the client is active and functioning in the access list, and can update screen to current view, but when join attempted, shows a brief error message, then closes the host session and screen connect must be restarted.  The client side shows I have connected, but then drops.  Using on premise version.

From app:

Your Version:6.5.16479.6613Latest Version:6.5.16479.6613Latest Eligible Version:6.6.17081.6648Download Location:https://www.screenconnect.com/Download