The polling fails constantly on author instances, and the error rate shows up in Java reporting such as New Relic. According to NR, the error is 401 on author instances. The errors reported in New Relic have identifiers (qtp631235405-15166) that match the log below.
*INFO* [qtp631235405-15166] org.apache.sling.auth.core.impl.SlingAuthenticator getAnonymousResolver: Anonymous access not allowed by configuration - requesting credentials
What is generating these HTTP HEAD requests, and is there a way to turn off whatever is making these requests?
Could you please provide some more information here. I personally have never seen this type of request on AEM publish instances. Suspect it might be something that will be coming from dispatcher but will be able to look further more once you provide some more information.