The custom 500 error page not working in ASP.NET MVC 5

Question

Here is my web.config custom errors configuration:

<system.web>
 <customErrors mode="On" redirectMode="ResponseRewrite" defaultRedirect="~/400.aspx">
  <error statusCode="404" redirect="~/404.aspx" />
  <error statusCode="500" redirect="~/500.aspx" />
  <error statusCode="400" redirect="~/400.aspx" />
</customErrors>
</system.web>
    <system.webServer>
    <httpErrors errorMode="Custom">
      <remove statusCode="404"/>
      <error statusCode="404" path="404.html" responseMode="File"/>
      <remove statusCode="500"/>
      <error statusCode="500" path="500.html" responseMode="File"/>
      <remove statusCode="400"/>
      <error statusCode="400" path="400.html" responseMode="File"/>
    </httpErrors>
 </system.webServer>

Works fine for 404. But this localhost:44303/< script >< /script > returns: Runtime Error.

As well throwing a new Exception from an action intentionally redirects to mvc error page, which I want to override with my 500.aspx

Mark Olsen Mark Olsen · Accepted Answer · 2015-01-13T13:08:40

After some research into the source code for the HandleErrorAttribute that is added as a global filter, there is code that tries to force application to use the MVC Error page.

So what I did was subclass the HandleErrorAttribute and effectively reverse that line:

public class MyHandleErrorAttribute : HandleErrorAttribute
{
    public override void OnException(ExceptionContext filterContext)
    {
        base.OnException(filterContext);

        filterContext.HttpContext.Response.TrySkipIisCustomErrors = false;
    }
}

Then replace the code in the App_Start/FilterConfig.cs to use the new MyHandleErrorAttribute:

filters.Add(new MyHandleErrorAttribute());

This should prevent MVC from overriding your custom 500 page.

The custom 500 error page not working in ASP.NET MVC 5

1 Answers