Subject

Why do I see [DENIED LOGIN] in access.log when performing docker login?

AuthorFullName__c: Maayan Amrani
articleNumber: 000004500
ft:sourceType: Salesforce
FirstPublishedDate: 2019-07-01T07:06:24Z
lastModifiedDate: 2021-09-23
VersionNumber: 5

What is the meaning of the following entry in access.log:
<TimeStamp> [DENIED LOGIN] for client : NA / <IP>