Communication Failure, Unable to communicate with the server

Right Click Tools- Enterprise
1

After installing the newest RCT with Enterprise Server on a new server instance, we are getting the message “Communication Failure, Unable to communicate with the server”.

During the installation using FQDN and port 444 the test is successful. We are trying to install on a 2016 RDS server. The old RCT with Enterprise Server installation worked.

2

Not sure why, but this error goes away if the “Run in ConfigMgr Console Process” checkbox, in the ‘Configure Recast Console Extension’ is checked.