[SOLVED] Can't connect to port, although it is open

Issue

I set up a raspi with Windows 10 IoT.

I then put up a firewall rule on the raspi to open port 1600 like so:

netsh advfirewall firewall add rule name="Open Port 1600" dir=in action=allow protocol=TCP localport=1600

The command netstat -an displays the following:

 TCP    10.3.10.200:1600       0.0.0.0:0              LISTENING

But when i run the command Test-NetConnection -Port 1600 "ComputerName" (on a computer in the same subnet) i get

WARNING: TCP connect to (fe80::4d23:cb14:dcf6:dc5b%9 : 1600) failed


ComputerName     : ComputerName
RemoteAddress    : 10.3.10.200
RemotePort       : 1600
InterfaceAlias   : Ethernet
SourceAddress    : 10.3.10.69
TcpTestSucceeded : True

I can ping the raspi without problems. I can also connect to port 8080 without any problems. Any ideas why the connection to port 1600 fails?

Solution

As @SKi suggested, the problem may come from trying to connect to an IPv6 address instead of the IPv4 address that you are listening to. Instead, you can try entering the IPv4 address, 10.3.10.200, as the "ComputerName" to restrict the test to IPv4.

Answered By - user8259632