System.Net.Sockets.SocketException

Question

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?

Does telnet 202.88.253.162 25 connect to the remote host?

spender
– spender

2011-06-14 12:56:41 +00:00
Commented Jun 14, 2011 at 12:56 — spender
– spender, Commented Jun 14, 2011 at 12:56

jgauffin · Accepted Answer · 2011-06-14 12:53:40Z

3

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

Possible causes for the error:

You are using the wrong IP address
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.

answered Jun 14, 2011 at 12:53

jgauffin

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Comments

AHFromHogwarts · Accepted Answer · 2019-12-31 05:16:12Z

0

Try using the IP 127.0.0.1 . It might work.

answered Dec 31, 2019 at 5:16

AHFromHogwarts

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