Hi All,

We are running a website on Umbraco version 8.5.4 and there are some issues with the 404 page.

Following is the scenario

https://www.mywebsite.com/abc working as per expectation and shows a 404 page from content tree

https://www.mywebsite.com/umbraco/abc not working as per expectation and stand asp.net error page as shown in below image

We have the following rules in umbracoSetting.config

   <errors>
      <error404>1260</error404>    
    </errors> 

And we have the following rules on the web.config.

    <httpErrors existingResponse="PassThrough">
  <remove statusCode="500" subStatusCode="-1" />
  <remove statusCode="400" subStatusCode="-1" />
  <remove statusCode="404" subStatusCode="-1" />
  <remove statusCode="403" subStatusCode="-1" />
  <error statusCode="500" path="/500.html" responseMode="ExecuteURL" />
  <error statusCode="400" path="/en/404" responseMode="ExecuteURL" />
  <error statusCode="404" path="/en/404" responseMode="ExecuteURL" />
  <error statusCode="403" path="/en/404" responseMode="ExecuteURL" />
</httpErrors>

So basically when /umbraco is there the 404 redirections are not working as per expected behavior.

Image given below.

Many thanks, Jigar

P.S:- The same set of configurations works well on V7 websites.