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Problem

The web application is inaccessible and the Windows error log shows this or a similar ASP.NET error.

[FileLoadException: Could not load file or assembly '<dll name>, Version=#.#.#.#, Culture=neutral, PublicKeyToken=' or one of its dependencies. Unverifiable code failed policy check. (Exception from HRESULT: 0x80131402)]

Solution

Make sure the trust level for the web application is "Full".

For example, for Adams Admin:

IIS > Server > Sites > Default Web Site > Adams Admin > .NET Trust Levels > Full

Select Apply

Other tools that help when an assembly cannot be loaded.

  1. Fuslogvw - shows where assemblies are found during the load process
  2. Process Monitor - helps find missing dependencies
    1. Filters:
      1. Process Name = w3wp.exe
      2. Path ends with <name of dll>
    2. Helpful article
  3. Security Policies for application pool user and machine
    1. Local Security Policy
    2. gpresult /s localhost /z
  4. Process Explorer - shows assemblies loaded for a process
    1. View > Select columns > Process Image > User Name
    2. View > Select columns > .NET > Assemblies
    3. Select w3wp.exe process > right click > Properties > .NET Assemblies



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