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AuthorForum: PowerTCP Emulation for .NET
Topic: Connect to non-standard port, how to set connect timeout?

From: Exeter, RI USA
Posts: 4
Member Since: 11/07/11
posted April 10, 2012 10:09 AM

Since I couldn't find it in documentation, here is how to connect to a port other than 23, for other people with this need:

System.Net.IPAddress hostAddress = System.Net.IPAddress.Parse(aIpAddr);
      Dart.Emulation.IPEndPoint dartPoint = new Dart.Emulation.IPEndPoint(hostAddress, aPort);

Now a question - How do I set a timeout for a telnet Connect() call?

If the user puts in an invalid address, I don't want it to hang a long time/forever.
Nick B (Admin)

From: Utica, NY USA
Posts: 593
Member Since: 05/25/10

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Custom Application Development

posted April 10, 2012 11:24 AM


No connect timeout is available because the .NET Framework Sockets does not provide a connect timeout.

If you're connecting to a hostname that your DNS does not have a record for, the connect method will quickly return with a 'No such host is known' exception. If you're attempting to connect to a specific IP, then it will throw a 'A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond' exception after 20 seconds.

If a connect timeout is required, you may setup a Timer where it calls Telnet.Close or Abort, and then instantiates a new instance of the Telnet class (it was not designed with this use in mind, I have entered an improvement request as TTWeb #5635 so that you will not need to re-instantiate the control in the Tick event)
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