FIX: When you use the TCPClient.Connect method to connect to a user control that runs in a Web page, the method call may take a long time to finish in the .NET Framework 1.1 SP1

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Article ID: 890323 - View products that this article applies to.
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When you use the TCPClient.Connect method to connect to a user control that runs in a Web page, the method call may take a long time to finish. For example, the method call may take 100 seconds to finish. This problem occurs if the following conditions are true:
  • You use the TCPClient class in Microsoft Visual Basic .NET 2003.
  • The computer that you are using is running the Microsoft .NET Framework 1.1 Service Pack 1 (SP1).


A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft .NET Framework 1.1 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.


You must have the Microsoft .NET Framework 1.1 SP1 installed to apply this hotfix.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
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File nameFile versionFile sizeDateTimePlatform


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


Steps to reproduce the problem

  1. In Visual Studio .NET 2003, create a Windows Control Library project.
  2. Add a Button control to the project.
  3. Double-click the Button control, and then add the following code to the top of the page.
    Imports System.Net.Sockets
    Imports System.Net
  4. Add the following code to the Click event of the Button control.
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    MsgBox("I begin to connect...")
    Dim tcpc As TcpClient
    tcpc = New TcpClient
    Dim objRemoteIp As IPAddress = IPAddress.Parse("<IIS server's IP address>")
    ' Note: Use the actual IP address of the server that is running Microsoft Internet Information Services (IIS).
    tcpc.Connect(objRemoteIp, 80)
    Catch ex As Exception
    MsgBox("There is an error:" & ex.Message)
    End Try
    End Sub
  5. On the Build menu, click Build WindowsControlLibrary1.
  6. Create an HTML file that contains the following code. Name the file Test.htm.
    <BODY MS_POSITIONING="GridLayout">
    <FORM id="Form1" method="post" runat="server">
    <OBJECT id="uc1" height="40" width="300" 
  7. Copy the Test.htm file and the WindowsControlLibrary1.dll control file to the Microsoft Internet Information Services (IIS) virtual directory.
  8. On a different computer that is running the .NET Framework 1.1 SP1, open the Test.htm page in a browser.
  9. Click Button1.
You notice the problem that is mentioned in the "Symptoms" section.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates


Article ID: 890323 - Last Review: October 9, 2011 - Revision: 3.0
  • Microsoft Visual Basic .NET 2003 Standard Edition
  • Microsoft .NET Framework 1.1 Service Pack 1
kbqfe kbHotfixServer kbfix kbbug KB890323

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