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Caspol: .Net 2.0 app failing on win 2008 when hosted on UNC path

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Helping one of mate in our team with issue where Asp.net application was failing with System.Security when contents were pointing to UNC path.We were getting following error in the browse:

Parser Error Message: Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. (\\abc02\myapp\web.config line 84)

This application was hosted on windows 2008 - IIS 7 server.

First thing came into my mind is to see whether we've set FullTrust according to KB 320268.
We were using caspol.exe to set permissions as we were missing Microsoft .NET Framework 2.0 Configuration tool (it gets installed with SDK) :-)

Running following command in CMD

C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727> caspol.exe -m -ag 1 -url "file:////\\computername\sharename\*" FullTrust -exclusive on

Application in question was still failing with same error. As a general troublehsooting step thought to try with new share folder and with simple test.aspx in it. Then added Fulltrust permission for that path and it worked. Now that made me to point finger toward the application compatibility.

Next steps was looking into procmon logs and it seem like .Net was trying to read config file from framework64 folder.That raise eyebrow and apparently application was hosted on win2008 x64 server and was running in native mode.

It turns out that .NET stores its security configuration separately for x64 and x32. Thatz it. we have to run the command again from the Framework64 instead of Framework folder

C:\WINDOWS\Microsoft.NET\Framework64\v2.0.50727> caspol.exe -m -ag 1 -url "file:////\\computername\sharename\*" FullTrust -exclusive on

Till then Blushing

Comments

  • Anonymous
    December 17, 2009
    Thanks for posting this! We were facing this exact problem.

  • Anonymous
    December 17, 2009
    Hi Mike, I'm glad it helpped you. Thanks JAs

  • Anonymous
    April 29, 2010
    Helped to sole my problem, thank you)

  • Anonymous
    November 15, 2010
    Hi, Thanks for this article, we had the same issue and after a couple of hours I found this site and 64bit, suddenly the light bulb came on and all was well with our IIS  :-) Thanks.

  • Anonymous
    May 12, 2011
    Thanks again, this helped me solve the same problem.

  • Anonymous
    February 08, 2014
    Thank you for this!  Saved my bacon during my migrations this weekend.