Errors and problems in running software manifest often in very interesting and non-obvious cases. A problem in location A manifests itself only with an unrelated error message in a different location B.
We also have one example of such a situation in AEM, and that’s the famous “Authentication support missing” error message. I see often the question “I got this error message; what should I do now?”, and so I decided: It’s time to write a blog post about it. Here you are.
“Authentication support missing” is actually not even correct: There is no authentication module available, so you cannot authenticate. But in 99,99% of the cases this is just a symptom. Because the default AEM authentication depends on a running SlingRepository service. And a running Sling repository has a number of dependencies itself.
I want to highlight 2 of these dependencies, because they tend to cause problems most often: The Oak repository and the RepositoryInitializer service. Both must be up and be started/run succesfully until the SlingRepository service is being registered succesfully. Let’s look into each of these dependencies.
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