Is there a way for debugging "Access Denied" errors in Drupal 8? I'm having some routing/permission issues, and I would like to be able to debug why i'm getting "Access Denied".

  • You can check watch_dog table. Please specifiy latest watchdog table information here so we can identify exact problem. – parth.k May 31 '16 at 8:26
  • It's not the exact problem i'm trying to find a solution for. I mostly find it myself by adjusting permissions or configuration, but it often takes some time because there's no clear indication what permission causes the 403. And I checked watchdog, only thing I can see is "access_denied" "route", "timestamp", "user", which I already knew :) – pjcarly May 31 '16 at 8:30
  • Have you tried to clear the cache table using drush ? drush cache-clear please try this command for drupal 8. – parth.k May 31 '16 at 8:47

Install the devel module and then Web Profile module which is bundled with it. You will then see the Symfony web profiler bar below the browser screen. Click on a Request gear icon, and it will show you the route and the controller class. You can start there.

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You can also search your code base for that route name and see, if there are additional cases when it is handled.

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  • This is usefull if the controller is letting you deny access, but since also elements can throw a denied this is not solely the answer for debugging an access denied. Webprofiler is a cool tool though. – absoludo Apr 19 '17 at 10:01
  • I can't see the toolbar, but I do see it in Admin. Is this because I'm anonymous in the page I want to debug? – JorgeeFG Oct 18 '18 at 0:04
  • @JorgeeFG The webprofiler for Drupal has a setting to show the toolbar even for anonymous users, if I remember correctly. You just need to check that setting. – Alexei Rayu Oct 18 '18 at 7:36
  • @AlexeiRayu I didn't find it in the module's settings :( – JorgeeFG Oct 18 '18 at 16:10
  • 1
    @JorgeeFG Looked it up - there is a permission "View webprofiler toolbar" in the permissions section that you can assign to anonymous users. – Alexei Rayu Oct 18 '18 at 16:25

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