Request for the permission of type 'System.Web.AspNetHostingPermission"

Question

I am facing a problem for running my website.

I have developed the website and when i hit F5 to view the results i am presented with this error

Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

How can i solve this problem.

Solution 1

This error usually happens if you Map your application folder on Network Drive or open Solution file from UNC Path. somthing like this:

Invalid Example: \\my-server\my-project

Try to open your solution from direct path

Valid Example: C:\Project\MyProject

You can also make change to your privilege of App Pool Identity but it's not recommanded:

Web Server (IIS) > App Pool Identity > Advance Settings > Set Identity as Network Service

Solution 2

the one shot solution worked for me was to set the App Pool Identity(Advance Settings) to Network Service

Solution 3

Try to set "Load User Profile" value of your application pool to "True". It worked for me.

Solution 4

For what its worth, I found that the AjaxControlKit.dll on the deployed server was blocked. To resolve this, I copied over the dll to a new folder then copied and pasted in the bin folder. I guess .net doesn't like a dll being copied over directly to the web folder

Solution 5

you can run the following command to Grant FullTrust to remote share:

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

Hope this helps.

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Comments

[RyanfaeScotland]

+1 From what I've found this is fairly undocumented around the web but has caught me out twice now. Thanks for sharing.

[htxryan]

Here is an official Microsoft support article confirming this issue, along with suggested fixes: support.microsoft.com/en-us/kb/320268

[Gabriel]

Thanks, this did the trick, must be marked as the answer. In my environment admin rights are not permited.

[Shaiju T]

for Go daddy i just made make change in web.config , check this

[Levimatt]

But, what happen if I have all solution files in a network drive pointing to a TFS?

[Shrink]

Glad it helped!

[N1njaB0b]

FYI, I had this problem twice. The first time, the 32-bit solution from @Shrink was the answer. This time, it was AjaxControlToolkit.dll needed to be unblocked. Just goes to show any one of these answers could be valid.

[Piotr Korlaga]

Works like a charm! Thanks a lot. btw. don't forget to restart your application pool after running this command