A potentially dangerous Request.Cookies value was detected from the client

Everytime when I open a Website Project/Web, Project in Visual Studio 2010 and try to run in Debug/non debug mode (F5/F11) I get this error error: "A potentially dangerous Request.Cookies value was detected from the client " .

I had installed VS 2010 SP1 a months ago, I'm not sure if it's related to this.

It happens to newly created project and existing projects. So I can't run any project.

I set the validaterequest in page and in web.config as most of the google search results sites suggested but I can't pass through this error.

Does someone know what the problem is and how to solve this problem?

SET in PAGE:

<%@ Page validateRequest="false" %>

SET in WEB.CONFIG:

<system.web>         
       <pages validateRequest="false" />     
</system.web> </br>

< /configuration>

Server Error in '/WebApp' Application.

A potentially dangerous Request.Cookies value was detected from the client (DNNPersonalization=". After setting this value, you can then disable request validation by setting validateRequest="false" in the Page directive or in the configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case. For more information, see http://go.microsoft.com/fwlink/?LinkId=153133.

Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Cookies value was detected from the client (DNNPersonalization="

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack tra开发者_C百科ce below.

Stack Trace:

[HttpRequestValidationException (0x80004005): A potentially dangerous Request.Cookies value was detected from the client (DNNPersonalization="

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Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.225

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Use

<system.web>
    <httpRuntime requestValidationMode="2.0" />
</system.web>

In your web.config

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You get this error when ASP.NET blocks pages from sending html tags in GET/POST arguments and cookies to prevent script injection attacks. You can either:

1. encode arguments/not send any html tags
2. disable request validation

You can disable request validation for the whole site by adding to Web.config:

<configuration>
    <system.web>
        <httpRuntime requestValidationMode="2.0" />
        <pages validateRequest="false" />
    </system.web>
</configuration>

To disable for a single page, add to Web.config:

<configuration>
    <system.web>
        <httpRuntime requestValidationMode="2.0" />
    </system.web>
</configuration>

and add to the .aspx page:

<%@ Page validateRequest="false" %> 

More Info: http://www.asp.net/learn/whitepapers/request-validation

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I had the same issue in MVC, while I was running the site under localhost. Simply delete the cookies.