Getting "A potentially dangerous Request.Path value was detected from the client (&)"

I've got a legacy code issue that requires that I support random urls as if they were requests for the home page. Some of the URLs have characters in them that generate the error "A potentially dangerous Request.Path value was detected from the client (&)". The site is written with ASP.Net MVC 3 (in C#) and is running on IIS 7.5.

Here's an example URL...

http://mywebsite.com/Test123/This_&_That

Here's how I have my catch-all route setup (I have other routes to catch specific pages)...

routes.MapRoute(
    "Default", // Route name
    "{garb1}/{garb2}", // URL with parameters
    new { controller = "Website", action = "Home", garb1 = UrlParameter.Optional, garb2 = UrlParameter.Optional } // Parameter defaults
);

I've added the following things to my web.config file...

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

I've also Added the ValidateInput attribute to the action that should be catching the urls...

public class WebsiteController : Controller
{
    [ValidateInput(false)]
    public ActionResult Home()
    {
        return View();
    }
}

But I'm still getting the error. Any ideas why? Did I miss something? Right now I'm just running on my local dev server (I haven't tried these fixes in production yet).

While you could try these settings in config file

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

I would avoid using characters like '&' in URL path replacing them with underscores.

I have faced this type of error. to call a function from the razor.

public ActionResult EditorAjax(int id, int? jobId, string type = ""){}

solved that by changing the line

from

<a href="/ScreeningQuestion/EditorAjax/5&jobId=2&type=additional" /> 

to

<a href="/ScreeningQuestion/EditorAjax/?id=5&jobId=2&type=additional" />

where my route.config is

routes.MapRoute(
            "Default", // Route name
            "{controller}/{action}/{id}", // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional }, new string[] { "RPMS.Controllers" } // Parameter defaults
        );

If you want to allow Html tags only for few textbox in mvc

You can do one thing

in controller

 [ValidateInput(false)]
public ActionResult CreateNewHtml()  //view
{
    return View();
}
[ValidateInput(false)]
[HttpPost]
public ActionResult CreateNewHtml(cbs obj)//view cbs is database class
{
    repo.AddHtml(obj);
    return View();
}

We were getting this same error in Fiddler when trying to figure out why our Silverlight ArcGIS map viewer wasn't loading the map. In our case it was a typo in the URL in the code. There was an equal sign in there for some reason.
http:=//someurltosome/awesome/place
instead of
http://someurltosome/awesome/place

After taking out that equal sign it worked great (of course).

Check the below lines are present in your web.config file

<system.web> <httpRuntime requestPathInvalidCharacters="" /> </system.web>