Database logs have multiple "Logon Login failed for user" from different IPs

Background: I have an SQL Server database running on Amazon RDS

The AWS dashboard has a section for logs and whenever I check the logs I see the following:

2018-04-27 06:10:26.00 Logon Error: 18456, Severity: 14, State: 5…. Continue reading Database logs have multiple "Logon Login failed for user" from different IPs