Request for the permission of type 'System.Net.DnsPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed

Hi ghouse_silver,

Based on your description. I understand that you want to find user’s IP address using code, but the program throws an exception.

My suggestion is as the followings:

1. Implement a custom CAS policy for your web application.


2. Require strongly naming for the DLL.

Here is a similar case for you to take a look:

http://social.technet.microsoft.com/Forums/sharepoint/en-US/c4779b22-6d7a-43a9-913a-97d2c0d97493/sharepoint-security-configurations

Using custom CAS policy files in SharePoint 2010:

http://www.insidesharepoint.net/post/2011/09/04/Using-custom-CAS-policy-files-in-SharePoint-2010.aspx

Please inform me freely if you have any questions.

Thanks,

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Qiao Wei

TechNet Community Support