Connection made but cannot perform functions

4 weeks ago our company software began having issues connecting on 2 separate networks.  Each of these networks connect every 30 minutes to transfer data to a central office. The Central office shows that the remote made contact with it but cannot perform any functions. We have reinstalled at both ends, removed firewall restrictions. We suspect a Windows update cause this. We changed to RADMIN VPN and the problem resolved itself. We want to use Hamachi though.  Had anyone experienced this?

This is our software log.  We tried different ports.  We enabled SMB1.  The log attempts to guess the problem but not correct.

System.ServiceModel.CommunicationException: An error occurred while receiving the HTTP response to https://25.6.x.xxx:8080/FileTranfer/mex. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details. ---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host