I'm attempting to use SSH.NET to create a tunnel from localhost:3306
to port 3306 on a remote machine:
PrivateKeyFile file = new PrivateKeyFile(@" .. path to private key .. ");
using (var client = new SshClient(" .. remote server .. ", "ubuntu", file))
{
client.Connect();
var port = new ForwardedPortLocal(3306, "localhost", 3306);
client.AddForwardedPort(port);
port.Start();
// breakpoint set within the code here
client.Disconnect();
}
When the breakpoint is hit, client.IsConnected
is returning true
, but telnet localhost 3306
is not connecting. If I create the connection using Putty instead, and set up the same tunnel there, it succeeds. What have I missed?
By changing the parameters of ForwardedPortLocal to:
var port = new ForwardedPortLocal("localhost", 3306, "localhost", 3306);
(to make it explicit which interface I was binding to), and adding the following code in just before port.Start();
:
port.RequestReceived += delegate(object sender, PortForwardEventArgs e)
{
Console.WriteLine(e.OriginatorHost + ":" + e.OriginatorPort);
};
I noticed the following being output:
::1:60309
The e.OriginatorHost
part of this was ::1
, which is the IPv6 equivalent of localhost
; however, the destination server was using IPv4. Changing the parameters to:
var port = new ForwardedPortLocal("127.0.0.1", 3306, "localhost", 3306);
forced the tunnel to run over IPv4 instead, and my code then worked exactly as I'd expected it to.