When you host a .NET application on a remote network share, you may receive a System.SecurityException exception error message or a security warning message.

The Code Access Security Policy tool (CASPOL) enables administrators to modify security policy for the machine policy level, the user policy level, and the enterprise policy level.

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    Caspol is used to fully trust a remote share, since by default network shares only get LocalIntranet permissions.

    Using Caspol.exe to Grant .NET Applications Rights to a Remote Network Share image 1

    The solution for the System.SecurityException exception error message is to use caspol to grant a .NET application the FullTrust right to a network share. To do this:

    1. Launch a command prompt with administrative credentials

    2. Change to the C:\Windows\Microsoft.NET\Framework\v2.0.50727 directory.

    3. Run the following command:

    caspol -m -ag 1 -url "file://\\server\share\*" FullTrust -exclusive on

    Replace \\server\share\ with the path to your .NET application located on the remote network share.

    Running the above command allowed me to resolve the following IIS 7.0 error:

    SecurityException: Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed

    By the way, .NET Framework 3.5 SP1 allows managed code to be launched from a network share.


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