System.Net.Sockets.SocketException:Could not find resource assembly

The "Could not find resource assembly" bit indicates that you have not deployed System.SR assembly that contains the exception descriptions.

It gives you the name of the method that failed: Dns.GetHostByAddress so look it up:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemnetdnsclassgethostbyaddresstopic2.asp

You can see what exceptions the method can throw and you actually know that you have a SocketException so, reading the documentation: "An error was encountered when resolving the address".

At this point, whether you are calling that method directly or whether it is called as a result of other call you make, the best thing is to show us some code and make sure that whatever address you are passing to TcpClient is reachable.

You can help yourself by catching the SocketException and querying its other helpful properties:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemnetsocketssocketexceptionmemberstopic.asp

Just fyi, if you browse the netcf assembly which contains the Dns class and have a look at the IL for the method in question (using ILDASM or Reflector etc) then you can go to the line 0x63 and then you'll see that it is the call to the native getgostbyaddr that returned null.

Cheers
Daniel

Ok, still getting error and it is strange

Here is the code I'm using

try

{

string hostname = "196.25.14.210";

TcpClient client = new TcpClient(hostname, 80);

NetworkStream stream = client.GetStream();

String HttpHeader = String.Format("GET http://{0} HTTP/1.1\r\nHost: {0}\r\n Connection: close\r\n\r\n", hostname);

stream.Write(Encoding.ASCII.GetBytes(HttpHeader), 0, HttpHeader.Length);

byte[] buffer = new byte[10000];

int nRead = stream.Read(buffer, 0, 10000);

client.Close();

System.Windows.Forms.MessageBox.Show(Encoding.ASCII.GetString(buffer, 0, nRead));

}

catch(Exception exc)

{

MessageBox.Show(exc.ToString());

}

If i run the above code with the dotted decimal address, it gives me a SocketException

If I replace hostname = www.google.com, it works nicely, returning me the HTTP 200 OK response

Any ideas on this one ?

Regards, radu