It is possible your Test-NetConnection command failed because the HServer is not actively "listening" on that port. It will open the connection, transfer the data and then close the connection again, but if the port is open, it will stay open.
I tried Putty's telnet option on my test box with the higher port number and it also returns "Connection Refused".
A better test might be to do a checkout using the "hco" command line utility and adding the "-tr" option. This will add extra tracing information to the hco.log that might help us find the problem.
We have seen checkout problems on some Windows 10 machines and these seem to be resolved by adding the hostname and IP address of the broker to your "C:\Windows\System32\drivers\etc\hosts" file.
Can you give this a try?
Thanks