SharePoint On-Prem Search Service Error: “Access Denied”

I got this error:

Search Service Application: Crawl Log – Error Breakdown

Access is denied. Verify that either the Default Content Access Account has access to this repository, or add a crawl rule to crawl this repository. If the repository being crawled is a SharePoint repository, verify that the account you are using has “Full Read” permissions on the SharePoint Web Application being crawled.

…but the “default content access account” already had “Full Read” permission on the web application.

  1. Check “DisableLoopbackCheck” in Windows Registry on SharePoint Server.
  2. Or check “BackConnectionHostNames” in Windows Registry on SharePoint Server.
  3. Check the content source setting: Is the web application url the one defined as “Default Zone” in Alternate Access Mappings of the web application?
  4. Check the authentication provider for the web application: SharePoint Search works with Windows Integrated Authentication. It is required that the “default zone” is configured with “Windows Integrated Authentication”, not “Basic Auth”!

Maybe the server requires a reboot after changing the configuration.

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