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TcpClient.Connect Method (IPAddress, Int32)

.NET Framework 4

Connects the client to a remote TCP host using the specified IP address and port number.

Namespace:  System.Net.Sockets
Assembly:  System (in System.dll)
C#
C++
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public void Connect(
	IPAddress address,
	int port
)

Parameters

address
Type: System.Net.IPAddress
The IPAddress of the host to which you intend to connect.
port
Type: System.Int32
The port number to which you intend to connect.
Exception Condition
ArgumentNullException

The address parameter is null.

ArgumentOutOfRangeException

The port is not between MinPort and MaxPort.

SocketException

An error occurred when accessing the socket. See the Remarks section for more information.

ObjectDisposedException

TcpClient is closed.

Call this method to establish a synchronous remote host connection to the specified IPAddress and port number. The Connect method will block until it either connects or fails. After connecting with the remote host, use the GetStream method to obtain the underlying NetworkStream. Use this NetworkStream to send and receive data.

Note Note

If you receive a SocketException, use SocketException.ErrorCode to obtain the specific error code. After you have obtained this code, you can refer to the Windows Sockets version 2 API error code documentation in MSDN for a detailed description of the error.
Note Note

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing.

The following code example uses an IP Address and port number to connect with a remote host.

C#
C++
VB
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            //Uses the IP address and port number to establish a socket connection.
            TcpClient tcpClient = new TcpClient ();
            IPAddress ipAddress = Dns.GetHostEntry ("www.contoso.com").AddressList[0];

            tcpClient.Connect (ipAddress, 11003);

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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XP and Windows 2003 Server work differently

It is important to know that TcpClient.Connect( string, int ) will work differntly in different environments. In our case we were working in a test environment where a host name was defined in the etc/hosts file on the development machine (XP sp3) and test server (win2003 SP2). In both case the hostname was resolved without a problem (ping hostname worked). The TcpClient.Connect () worked fine on the development workstation (XP SP3) it failed to connect on the test server (WIn2003SP2) with a 10011 socket error (host cannot be found) using the code

this.tcpClient.Connect( System.Net.Dns.GetHostAddresses( Host() )[0], Port() );

was needed to have it working on both XP and Windows2003. 

 

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