FIX: Internet Explorer times out when it opens an ASPX page and when it uses Big-IP, SQUID Proxy Server software, SSL, and HTTP/1.0


Microsoft Internet Explorer appears to stop responding (hang) or time out when it calls the Response.Flush method.

Note This behavior only occurs when Internet Explorer opens an ASPX page over Big-IP by using Secure Socket Layers (SSL), a server that is running SQUID Proxy Server software, and HTTP/1.0 (at the client browser). The following code causes this behavior:


This problem occurs because the server has agreed to keep-alives in the response header by using the Connection: Keep-Alive header. However, the server does not send a Content-Length header or a Transfer-Encoding header. Big-IP thinks the keep-alive in the response is not valid. This behavior prevents the Big-IP OneConnection engine from being able to parse the connection. This behavior leads to the failure.

Note By design, the Content-Length header is not sent when the Response.Flush method is called. When headers are sent, the Content-Length is not known.


Software update information

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.


No prerequisites are required.

Restart requirement

You do not have to restart your computer after you apply this software update.

Software update replacement information

This software update does not replace any other software updates.

File information

The English version of this software update has the file attributes (or later) 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.

Date Time Version Size File name
19-May-2004 03:22 1.1.4322.1045 258,048 Aspnet_isapi.dll
19-May-2004 03:22 1.1.4322.1045 20,480 Aspnet_regiis.exe
19-May-2004 03:22 1.1.4322.1045 32,768 Aspnet_state.exe
19-May-2004 03:22 1.1.4322.1045 32,768 Aspnet_wp.exe
05-Apr-2004 21:39 33,718 Installpersistsqlstate.sql
05-Apr-2004 21:39 34,342 Installsqlstate.sql
05-Apr-2004 21:39 35,243 Installsqlstatetemplate.sql
19-May-2004 03:12 1.1.4322.1045 94,208 Perfcounter.dll
19-May-2004 03:17 8,685 Smartnav.js
19-May-2004 23:39 1.1.4322.1045 1,224,704 System.dll
19-May-2004 23:39 1.1.4322.1045 241,664 System.messaging.dll
19-May-2004 23:40 1.1.4322.1045 323,584 System.runtime.remoting.dll
19-May-2004 23:39 1.1.4322.1045 131,072 System.runtime.serialization.formatters.soap.dll
19-May-2004 23:40 1.1.4322.1045 1,257,472 System.web.dll
19-May-2004 23:40 1.1.4322.1045 819,200
19-May-2004 23:39 1.1.4322.1045 569,344
19-May-2004 23:40 1.1.4322.1045 1,339,392 System.xml.dll
03-Oct-2003 20:20 2,119 Uninstallsqlstatetemplate.sql
19-May-2004 03:17 14,482 Webuivalidation.js


To work around this problem, make any one of the following changes to the system that is described in the "Symptoms" section:
  • Do not use SSL.
  • Do not go through a server that is running SQUID Proxy Server software.
  • Do not call the Response.Flush method in the code.
  • In Internet Explorer, follow these steps:
    1. On the Tools menu, click Internet Options.
    2. On the Advanced tab, click to select the Use HTTP 1.1 through proxy connections check box.


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

More Information

For additional information, 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


ID do Artigo: 841998 - Última Revisão: 13 de mai de 2008 - Revisão: 1