Unable to establish connection.rsync: failed to connect to server: Connection refused (111)

• Ensure any firewall is either disabled or properly configured to allow port 873 traffic from client to server.
• Ensure the server is listening on the target machine

Try the following troubleshooting techniques

• Check if DeltaCopy service is running on the server. If it is not, start the service from Windows Control Panel
• Ensure that you can ping the server. Note that a successful ping does not guarantee a successful TCP/IP connection on a specific port. Therefore, additional test is required. A ping ensure two machines can see each other.
• Open a console (DOS) window on the server machine and type the following
  
  telnet localhost 873
  
  The server is listening if you see a blank screen. If you get a connection error, it means that the rsync daemon is not listening. Find out why it is not running.
• Repeat the same procedure from your client machine. However, the command will now look like following.
  
  telnet YourServerIP 873
  
  
• If you do not see a blank screen, that indicates a network problem. Your client machine cannot open a TCP/IP connection to the server. Most likely this is a firewall issue. There could be two firewalls in picture:
  1. Provided by the operating system on the server machine. Most modern OS have a built-in firewall. You will either have to open port 873 or allow rsync.exe to listen.
  2. Provided by a device, most likely a router sitting at the edge of your network