500 page is returned where a 404 page should be returned

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Ras 61 posts 324 karma points

Oct 12, 2021 @ 12:12

Using Umbraco And Getting Started

Umbraco 8

Hi, I've set up my custom error pages as such in my web config files:

    <httpErrors errorMode="Custom" existingResponse="Replace" xdt:Transform="InsertIfMissing">
        <remove statusCode="404" subStatusCode="-1" xdt:Transform="InsertIfMissing"/>
        <remove statusCode="500" subStatusCode="-1" xdt:Transform="InsertIfMissing"/>

        <error statusCode="404" prefixLanguageFilePath="" path="/1227" responseMode="ExecuteURL" xdt:Transform="InsertIfMissing" />
        <error statusCode="500" prefixLanguageFilePath="" path="/1230" responseMode="ExecuteURL" xdt:Transform="InsertIfMissing" />
    </httpErrors>

However a 500 page is returned in every case, even where a 404 page should be returned. Both of the ID's in the path="" are ID's of my 404 and 500 pages respectively, in the backoffice.

In the log viewer I get this error:

System.InvalidOperationException: Sequence contains no elements
   at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
   at Umbraco.Core.Configuration.UmbracoSettings.ContentErrorsElement.get_Error404Collection() in D:\a\1\s\src\Umbraco.Core\Configuration\UmbracoSettings\ContentErrorsElement.cs:line 13
   at Umbraco.Core.Configuration.UmbracoSettings.ContentElement.get_Error404Collection() in D:\a\1\s\src\Umbraco.Core\Configuration\UmbracoSettings\ContentElement.cs:line 17
   at Umbraco.Web.Routing.ContentFinderByConfigured404.TryFindContent(PublishedRequest frequest) in D:\a\1\s\src\Umbraco.Web\Routing\ContentFinderByConfigured404.cs:line 57
   at Umbraco.Web.Routing.PublishedRouter.HandlePublishedContent(PublishedRequest request) in D:\a\1\s\src\Umbraco.Web\Routing\PublishedRouter.cs:line 459
   at Umbraco.Web.Routing.PublishedRouter.FindPublishedContentAndTemplate(PublishedRequest request) in D:\a\1\s\src\Umbraco.Web\Routing\PublishedRouter.cs:line 398
   at Umbraco.Web.Routing.PublishedRouter.PrepareRequest(PublishedRequest request) in D:\a\1\s\src\Umbraco.Web\Routing\PublishedRouter.cs:line 131
   at Umbraco.Web.UmbracoInjectedModule.ProcessRequest(HttpContextBase httpContext) in D:\a\1\s\src\Umbraco.Web\UmbracoInjectedModule.cs:line 134
   at Umbraco.Web.UmbracoInjectedModule.<Init>b__18_4(Object sender, EventArgs e) in D:\a\1\s\src\Umbraco.Web\UmbracoInjectedModule.cs:line 414
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Any advice how to move forward?

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Huw Reddick 1737 posts 6077 karma points MVP c-trib

Oct 14, 2021 @ 13:26

your 404 should be set up in config\umbracosettings.config, as it is handled by Umbraco, then set up your other error handling like below (you need both sets for it to work correctly)

  <system.web>
    <customErrors mode="On" redirectMode="ResponseRewrite" defaultRedirect="/errorHandler">
      <error statusCode="500" redirect="/errorHandler" />
    </customErrors>
</system.web>

  <system.webServer>
    <httpErrors errorMode="Custom" existingResponse="Replace">
      <remove statusCode="404" />
      <remove statusCode="500" />
      <error statusCode="404" prefixLanguageFilePath="" path="/error404" responseMode="ExecuteURL" />
      <error statusCode="500" prefixLanguageFilePath="" path="/errorHandler" responseMode="ExecuteURL" />
    </httpErrors>
</system.webServer>

set the paths to whatever your path should be

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