Webpage takes longer than expected to load in Internet Explorer 9 on a Windows 7 or Windows Server 2008 R2-based computer

Consider the following scenario:

• You have Windows Internet Explorer 9 installed on a computer that is running Windows 7 or Windows Server 2008 R2.�
• You configure Internet Explorer to use an automatic configuration script. To do this, you follow these steps:�
  • In the Internet Options dialog box, click the Connections tab, and then click LAN settings.
  • Select the Use automatic configuration script�check box, and then type the location of the proxy auto-config (PAC) file in the�Address text box.
• You clear the Automatically detect settings check box.
• You configure multiple proxies in the PAC file. For example, you edit the PAC file content as follows:

  function FindProxyForURL(url, host)
  {
       return "PROXY proxy1:80; PROXY proxy2:80";
  }

• The first proxy in the list becomes unreachable or does not exist.
• You try to browse a webpage.

In this scenario, it takes longer than expected to load the webpage.

This issue occurs because Internet Explorer 9 takes a long time to complete a proxy failover. After the unreachable proxy is detected, Internet Explorer still tries to use the proxy.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running Internet Explorer 9 in Windows 7 or Windows Server 2008 R2.

Registry information

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: After you apply this hotfix, you must create a registry key before you restart the computer. To do this, follow these steps:

For all supported x86-based versions of Windows 7

1. Click Start
   , type regedit in the Search programs and files box, and then press ENTER.
   If you are prompted for an administrator password, type the password. If you are prompted for confirmation, provide confirmation.
2. Locate and then click the following registry subkey:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl
3. Right-click FeatureControl, point to New, and then click Key.
4. Type FEATURE_BAD_PROXY_LIST_KB2777234, and then press ENTER.
5. Right-click FEATURE_BAD_PROXY_LIST_KB2777234, point to New, and then click DWORD Value.
6. Type iexplore.exe, and then press ENTER.
7. Right-click iexplore.exe, and then click Modify.
8. In the Value data box, type 00000001, and then click OK.
9. Exit Registry Editor.

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

1. Click Start
   , type regedit in the Search programs and files box, and then press ENTER.
   If you are prompted for an administrator password, type the password. If you are prompted for confirmation, provide confirmation.
2. Locate and then click the following registry subkey:
   HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Main\FeatureControl
3. Right-click FeatureControl, point to New, and then click Key.
4. Type FEATURE_BAD_PROXY_LIST_KB2777234, and then press ENTER.
5. Right-click FEATURE_BAD_PROXY_LIST_KB2777234, point to New, and then click DWORD Value.
6. Type iexplore.exe, and then press ENTER.
7. Right-click iexplore.exe, and then click Modify.
8. In the Value data box, type 00000001, and then click OK.
9. Locate and then click the following registry subkey:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl
10. Right-click FeatureControl, point to New, and then click Key.
11. Type FEATURE_BAD_PROXY_LIST_KB2777234, and then press ENTER.
12. Right-click FEATURE_BAD_PROXY_LIST_KB2777234, point to New, and then click DWORD Value.
13. Type iexplore.exe, and then press ENTER.
14. Right-click iexplore.exe, and then click Modify.
15. In the Value data box, type 00000001, and then click OK.
16. Exit Registry Editor.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 7 and Windows Server 2008 R2 file information notes

Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

• The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

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

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2