FIX: "No appropriate server could be found to route the request" error message when you use an ARR server farm in IIS 7.0 or in IIS 7.5 if you enable the External Cache option

Applies to: Internet Information Services 7.5

Symptoms


Consider the following scenario:
  • You install the Microsoft Application Request Routing (ARR) 2.0 or 2.1 module on a computer that is running Internet Information Services (IIS) 7.0 or IIS 7.5.
  • You enable the External Cache option when you configure the host name affinity of an ARR server farm.
In this scenario, a client may encounter the "502.4" error code for a client request, and then the client receives the following error message:
No appropriate server could be found to route the request.

Resolution


Update information

The following files are available for download from the Microsoft Download Center:

Download Download the x86-based version of the update for IIS 7.0 or for IIS 7.5 package now.
Download Download the x64-based version of the update for IIS 7.0 or for IIS 7.5 package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
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Prerequisites

To apply this update, you must have the ARR 2.0 or ARR 2.1 module for Internet Information Services (IIS) 7.0 or for IIS 7.5 installed.

To download the x86-based version of the ARR 2.0 module for IIS 7.0 or for IIS 7.5, visit the following Microsoft website:
To download the x64-based version of the ARR 2.0 module for IIS 7.0 or for IIS 7.5, visit the following Microsoft website:

Restart requirement

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

Update replacement information

This update does not replace any other update.

File Information


The English version of this update 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 item in Control Panel.
For all supported x86-based versions of ARR for IIS 7.0 or for IIS 7.5
File nameFile versionFile sizeDateTimePlatform
Ecache.dll7.1.902.059,76010-Aug-201015:30x86
For all supported x64-based versions of ARR for IIS 7.0 or for IIS 7.5
File nameFile versionFile sizeDateTimePlatform
Ecache.dll7.1.902.065,89610-Aug-201015:25x64
Ecache.dll7.1.902.059,76010-Aug-201015:30x86

Status


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

More Information


For more information about how to use multiple ARR servers, visit the following Microsoft website:For more information about the ARR module, visit the following Microsoft website: