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Editorial Team
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Asked: 2026-06-13T12:23:09+00:00

I downloaded the latest DotNetOpenAuth code from GitHub and initially it failed to build.

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I downloaded the latest DotNetOpenAuth code from GitHub and initially it failed to build. I fixed the problem by running the following:

sn -Vr *,2780ccd10d57b246

found here:

http://www.dotnetopenauth.net/developers/contributing/quickstart-environment/

I went ahead and did some modifications to the project DotNetOpenAuth.AspNet. It compiled just fine. Then I created an MVC 4 web project under samples to test my changes. The solution again compiled. However as soon as I click on debug I get the ASP.NET yellow screen of death with the following error:

Could not load file or assembly ‘DotNetOpenAuth.AspNet’ or one of its dependencies. Strong name signature could not be verified. The assembly may have been tampered with, or it was delay signed but not fully signed with the correct private key. (Exception from HRESULT: 0x80131045)

The MVC 4 project was created from the Empty Template, so there is no reference to Microsoft.Web.WebPages.OAuth

What am I missing? I completed the rest of the steps found in the link above:

sn -k mykeyfile.pfx 
sn -i mykeyfile.pfx mykeycontainer
sn -p mykeyfile.pfx mykeyfile.pub 
sn -q -t mykeyfile.pub
sn -Vr *,<YourPublicKeyTokenHere>

and also modified the file \tools\DotNetOpenAuth.props, specifically the lines: 27,29,30 with the new values

26. <SignAssembly>true</SignAssembly>
27. <PublicKeyFile Condition="'$(PublicKeyFile)' == ''">$(ProjectRoot)src\official-build-key.pub</PublicKeyFile>
28. <AssemblyOriginatorKeyFile Condition="'$(AssemblyOriginatorKeyFile)' == ''">$(PublicKeyFile)</AssemblyOriginatorKeyFile>
29. <KeyPairContainer Condition="'$(KeyPairContainer)' == ''">DotNetOpenAuth</KeyPairContainer>
30. <PublicKeyToken>2780ccd10d57b246</PublicKeyToken>
31. <DelaySign>true</DelaySign>
32. <SignedSubPath>signed\</SignedSubPath>
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1 Answer

  1. Editorial Team

    Modifying the props file shouldn’t be necessary.
    The issue is likely that you’re on a 64-bit machine, and the sn command you ran only impacted the 32-bit registry. Then at runtime you fail because you’re running the web site on the 64-bit registry, which doesn’t have the skip verification entry in it.

    The “right” way to do it is to install the 64-bit Windows SDK so that you get 64-bit sn.exe and run that command as well. However, here’s the fast and easy way:

    Check out the value of your reg key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\StrongName\Verification\*,2780ccd10d57b246

    and copy that key over to

    HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\StrongName\Verification\*,2780ccd10d57b246

    Then restart all the relevant processes (MSBuild.exe, devenv.exe, iis, WebDAV, or whatever it is that’s hosting your web site and reporting the error). It should start working for you.

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