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The command syntax is as follows:

netsh interface portproxy add v4tov4 listenaddress=localaddress listenport=localport connectaddress=destaddress connectport=destport

where



  • listenaddress –is a local IP address to listen for incoming connection (useful if you have multiple NICs in different subnets/VLANs or multiple IP addresses on one interface);
  • listenport – a local TCP port number to listen on (the connection is waiting on);
  • connectaddress – is a local or remote IP address (or DNS name) to which you want to redirect the incoming connection;
  • connectport – is a TCP port to which the connection from listenport is forwarded to.
Using the netsh interface portproxy add v4tov6/v6tov4/v6tov6 options, you can create port forwarding rules between IPv4 and IPv6 a

netstat -na|find "3340"

Alternatively, you can check that the port is not listening locally using the PowerShell cmdlet Test-NetConnection:

Test-NetConnection -ComputerName localhost -Port 3340