Socket problem (Connection refused)

  • Thread starter Thread starter cody
  • Start date Start date
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cody

Hi I'm created a socket listening on port 1234 (it is shown that this post
is in listening mode if I use NETSTAT). Now Iam trying to connect to this
port:

IPHostEntry entry = Dns.Resolve("localhost");
serverConn = new Socket(entry.AddressList[0].AddressFamily,
SocketType.Stream, ProtocolType.Tcp);
IPEndPoint endpoint = new IPEndPoint(entry.AddressList[0], 1234);
serverConn.Connect(endpoint);

But I get a SocketException that the remotecomputer has denied the
connection request. What could be the cause of this? Both apps running local
and I have no firewall (Win2K).

I tried Accept() in blocking and nonblocking mode on the server but neither
worked.
 
both server and client must have same port. i'm not familiar NETSTAST.
"the connection refused mean the other side must have same port as the
other side..
i'm only working on system.net. similar to mirc.
regards,
 
Hi cody,
what happens if with listening started you call from command prompt:

telnet localhost 1234?

Also, how you create the listener?

Sunny
 
what happens if with listening started you call from command prompt:
telnet localhost 1234?
Click to expand...

Good idea I'll try it tomorrow in my company.
Also, how you create the listener?
Click to expand...

I do not have the src here but I think I did it this way:

IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream,
ProtocolType.Tcp);
socket.Bind(new IPEndPoint(ipAddress, 1234));
socket.Listen(10);
Socket s = socket.Accept(); // exception thrown here
Hi I'm created a socket listening on port 1234 (it is shown that this post
is in listening mode if I use NETSTAT). Now Iam trying to connect to this
port:

IPHostEntry entry = Dns.Resolve("localhost");
serverConn = new Socket(entry.AddressList[0].AddressFamily,
SocketType.Stream, ProtocolType.Tcp);
IPEndPoint endpoint = new IPEndPoint(entry.AddressList[0], 1234);
serverConn.Connect(endpoint);

But I get a SocketException that the remotecomputer has denied the
connection request. What could be the cause of this? Both apps running local
and I have no firewall (Win2K).

I tried Accept() in blocking and nonblocking mode on the server but neither
worked.
Click to expand...
Click to expand...
 
Hi,

try with:

socket.Bind(new IPEndPoint(IPAddress.Any, 1234);

this will bind the socket to all adapters.

If it works, you have to investigate why and if DNS resolve returns
different IPAddresses on the client and on the server.

Sunny

what happens if with listening started you call from command prompt:

telnet localhost 1234?
Click to expand...

Good idea I'll try it tomorrow in my company.
Also, how you create the listener?
Click to expand...

I do not have the src here but I think I did it this way:

IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream,
ProtocolType.Tcp);
socket.Bind(new IPEndPoint(ipAddress, 1234));
socket.Listen(10);
Socket s = socket.Accept(); // exception thrown here
Hi I'm created a socket listening on port 1234 (it is shown that this post
is in listening mode if I use NETSTAT). Now Iam trying to connect to this
port:

IPHostEntry entry = Dns.Resolve("localhost");
serverConn = new Socket(entry.AddressList[0].AddressFamily,
SocketType.Stream, ProtocolType.Tcp);
IPEndPoint endpoint = new IPEndPoint(entry.AddressList[0], 1234);
serverConn.Connect(endpoint);

But I get a SocketException that the remotecomputer has denied the
connection request. What could be the cause of this? Both apps running local
and I have no firewall (Win2K).

I tried Accept() in blocking and nonblocking mode on the server but neither
worked.
Click to expand...
Click to expand...
Click to expand...
 
Hi,
try with:

socket.Bind(new IPEndPoint(IPAddress.Any, 1234);

this will bind the socket to all adapters.

If it works, you have to investigate why and if DNS resolve returns
different IPAddresses on the client and on the server.
Click to expand...


You are right, that was the problem!

Thank you!
 
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