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Editorial Team
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Asked: 2026-05-23T02:51:46+00:00

Encoding en = Encoding.GetEncoding(iso-8859-1); // default encoding IPHostEntry IPhst = Dns.GetHostEntry(_Host); IPEndPoint endPt =

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Encoding en = Encoding.GetEncoding("iso-8859-1"); // default encoding
IPHostEntry IPhst = Dns.GetHostEntry(_Host);
IPEndPoint endPt = new IPEndPoint(IPhst.AddressList[0], 25);
Socket s = new Socket(endPt.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
s.Connect(endPt);

Here am getting the error like:

System.Net.Sockets.SocketException: 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 202.88.253.162:25
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)”

How i can solve this?

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1 Answer

  1. Editorial Team

    The is no server listening at specified ip/port that you are trying to connect to.

    Possible causes for the error:

    1. You are using the wrong IP address
    2. You are using the wrong port

    Update

    Didn’t see that you are trying to connect to a SMTP server. Many ISP:s block port 25 for all ip addresses except their own SMTP servers. It’s to reduce SPAM emails. So that could be the cause too.

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