TryLoginAsync attempt 2 about telnet HOT 3 CLOSED

Look at the code inside TryLoginAsync; it's just a wrapper for a few consecutive reads/writes. The CancellationToken/Timeout implementation I put in but used minimally and it served my purposes; clearly you've found something that isn't quite right.

from telnet.

After further digging I have found that it is not the TryLoginAsynch call that is the issue. It is the call to create a new telnetclient object.
If Telnet is not enabled on my R7000 the TCP session request is refused which I assume is sent by the call -
var telnetClient = new PrimS.Telnet.Client(IPaddress, 23, new CancellationToken());

So I assume the telnetClient object will not get created but I'm not savvy enough to understand why I don't get an exception in the subsequent code.

I have found a workaround. If I call the async method containing the code above with an await inside a try catch then I do catch an exception. so the following works:

public static async Task CheckTelnetCanConnect()
{
var telnetClient = new PrimS.Telnet.Client("XXX.XXX.XX.XX", 23, new CancellationToken());
var connection = await telnetClient.TryLoginAsync("root", "password", loginTimeoutMs: 10000);
if (telnetClient.IsConnected)
{
Console.WriteLine("Telnet is Connected");
Console.ReadLine();
telnetClient.Dispose();
return true;
}
else
{
Console.WriteLine("Telnet Connect Failed");
Console.ReadLine();
telnetClient.Dispose();
return false;
}
}

Called by -

try
{
await CheckTelnetCanConnect();
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
I get a Socket exception telling me the target machine actively refused the connection (TCP SYN) request.

If the await is not used on the call I see no exceptions or errors anywhere

Mike

from telnet.

Thanks for coming back and documenting. You've got something that works now so I'll close.

from telnet.