http-error

HTTP Error 404.19 - Not Found in IIS 8.5

I have a website, which runs perfectly in IIS 7.5. but the same site with same configuration is not working properly in IIS 8.5. i am passing an system string variable in URL and it shows me 

HTTP Error 404.19 - Not Found error.

So i am not able to catch the exact issue. All things are same for both IIS except IIS version only. So i need your thoughts for the problem. So that I can also look into this. Unfortunately I am new in .net, so need basic answer(s). Thanks.

If I pass "&system=value1"in URL for IIS8.5 then it stops working, even this also didn't generate any log for this. So please help me for this.

I just Came to know that if i use "sys" word in Query String then its giving error. How to avoid this issue now?

Solution

  • I had this issue after switching from an Azure app service to DiscountASP.net. I had to add the following to the web.config in my site's folder to fix the IIS config:

    <system.webServer> 
  <security>
    <requestFiltering>
      <filteringRules>
         <remove name="facebookexternalhit" />  
      </filteringRules>
    </requestFiltering>  
  </security>  
</system.webServer>

    The first time I tried this it did not work. However, I emailed support and they explained THEY had to fix it "at the root." So, fwiw this DOES work, but in a shared hosting environment, you may need to put it in the server's web.config, possibly replacing the rule name to what's appropriate for your hosting provider.