TcpClient.Connect Method (IPAddress, Int32)


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)

Public Sub Connect (
	address As IPAddress,
	port As Integer


Type: System.Net.IPAddress

The IPAddress of the host to which you intend to connect.

Type: System.Int32

The port number to which you intend to connect.

Exception Condition

The address parameter is null.


The port is not between MinPort and MaxPort.


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


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.


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.


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

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

'Uses the IP address and port number to establish a socket connection.
Dim tcpClient As New TcpClient
Dim ipAddress As IPAddress = Dns.GetHostEntry("").AddressList(0)
tcpClient.Connect(ipAddress, 11003)

.NET Framework
Available since 1.1
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