Citrix Storefront – HTTP Error 503. The service is unavailable.



Service Unavailable

HTTP Error 503. The service is unavailable.

Event Viewer error

Source: IIS-W3SVC-WP

Event ID: 2293

Description: The Module name ManagedEngine64 path C:\Windows\Microsoft.NET\Framework64\v2.0.50727\webengine.dll returned an error from registration.  The data is the error.

Application Pool ‘DefaultAppPool’ won’t start.


Browse to: %Windir%\system32\inetsrv\config

Backup the ApplicationHost.config file

Open ApplicationHost.config

Look for <add name=”ManagedEngine64″ (around line 267) and delete the whole line

<add name=”ManagedEngine64″ image=”%windir%\Microsoft.NET\Framework64\v2.0.50727\webengine.dll” preCondition=”integratedMode,runtimeVersionv2.0,bitness64″ />

Save the file and run IISRESET


The cause was related to the fix of making the Storefront console load faster, by putting <generatePublisherEvidence enabled=”false”/> into C:\Windows\Microsoft.NET\Framework\v2.0.50727\aspnet.config or c:\Windows\Microsoft.NET\Framework64\v2.0.50727\aspnet.config


This fix is still valid but needs to be done AFTER installing and configuring Storefront the first time.