ManagedPipelineHandler for an AJAX POST crashes if an IE9 user navigates away from a page while that call was in progress

Question

Scenario:

• User is using IE9 (IE8/10 not affected).
• User has an active session.
• Page starts an AJAX POST (GET not affected) request to a contr

Answer 1

This appears to be a regression in ASP.NET 4.5. Our team is working on a patch, but as a temporary workaround try placing this line in Web.config (more info here):

<system.webServer>
  <serverRuntime uploadReadAheadSize="0" />
</system.webServer>

Please let us know if this works for you!

Answer 2

Levi's answer works great in IIS 7.5 or higher. But if you are running Server 2008 R1, the following command will also set the setting:

c:\windows\system32\inetsrv\appcmd.exe set config "sitename" -section:system.webServer/serverRuntime /uploadReadAheadSize:"0" /commit:apphost 

But, a better fix is to apply the hotfix from Microsoft which remedies the issue (#6 in the attached KB article)

http://support.microsoft.com/kb/2828841/EN-US
http://support.microsoft.com/kb/2828842/EN-US