Getting 'failed to access IIS metabase' error when attempting to load the Silverlight Application Builder


After installing the ArcGIS Viewer for Silverlight, attempting to open the builder yields the following message in the browser:

"Server Error in '/Builder' Application."

"Failed to access IIS metabase.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.Hosting.HostingEnvironmentException: Failed to access IIS metabase.

The process account used to run ASP.NET must have read access to the IIS metabase (e.g. IIS://servername/W3SVC). For information on modifying metabase permissions, please see

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272"


This error occurs when IIS Server is installed after installing the .NET framework. .NET needs to be re-registered so that IIS recognizes it.

Solution or Workaround

Open a Command Prompt window, paste the following line, and press Enter:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i

Modify the string above with the version of .NET that is being run.

    Article ID:000011854

    • ArcGIS API for Silverlight 3 x

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