IIS 7.5 and Adobe PDF Files Hot Fix

Consider the following scenario:

• You install Internet Information Services (IIS) 7.5 on a computer that is running Windows Vista, Windows 7, Windows Server 2008, or Windows Server 2008 R2.
• You host some Portable Document Format (PDF) documents on an IIS Web site on this computer.
• You have a client computer that has the Adobe PDF Reader plug-in enabled on a Web browser.
• You use this Web browser to open one of the PDF documents that is hosted on the IIS Web site.

In this scenario, you cannot open the PDF document. Additionally, the Web browser may stop responding.
Note

• You may still be able to open other PDF documents on this IIS Web site when this issue occurs.
• This issue does not affect all versions of the Adobe PDF Reader plug-in.

CAUSE

This issue occurs because of a design change in IIS 7.5. When you try to open a…

This issue occurs because of a design change in IIS 7.5.
When you try to open a PDF document on an IIS Web site, the Adobe PDF Reader plug-in sends a request that includes multiple byte ranges to IIS 7.5. If the union of the multiple byte ranges is a single byte range, the response from IIS 7.5 contains the byte ranges merged into a single byte range (also known as a merged byte-range request). The response to this single byte range does not include the multipart/byteranges content type. However, the multipart/byteranges content type is expected to be included in a response to a merged byte-range request. This behavior causes the Adobe PDF Reader plug-in to handle the response incorrectly. Therefore, the PDF document cannot be opened.
Note The multipart/byteranges content type is included in a regular multiple byte-ranges response.

RESOLUTION

To resolve this issue, apply this hotfix on the computer that is running IIS 7.5…

To resolve this issue, apply this hotfix on the computer that is running IIS 7.5.

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 Web site:

http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)

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 Windows Vista, Windows 7, Windows Server 2008, or Windows Server 2008 R2.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

To make this easier for everyone, you can download the hotfix here:

KB Article Number(s): 979543
Language: All (Global)
Platform: x64
Location: (http://hotfixv4.microsoft.com/Windows%207/WindowsServer%202008%20R2/sp1/Fix311271/7600/free/408888_intl_x64_zip.exe)
Password: qmFj]I4