Why are these errors occurring?
The request rate to Amazon S3 is too high.
There is an error with the Amazon RDS database.
The requests to Amazon S3 do not have the proper permissions.
The users are in a different geographical region and Amazon Route 53 is restricting access.
Explanations:
A 503 Service Unavailable error occurs when the request rate exceeds the capacity of the service. Amazon S3 can throttle requests if they exceed a certain threshold, which can cause service disruptions. This matches the issue described.
Amazon RDS is a relational database service, which is unrelated to a static website hosted on Amazon S3. Static websites do not require a database unless explicitly configured, which isn’t the case here.
If there were a permissions issue, users would typically encounter a 403 Forbidden error, not a 503 error. A 503 error is related to service availability, not permissions.
While users in different geographical regions may experience latency or DNS resolution issues, Route 53 does not cause 503 errors. This error points to server-side capacity problems, not access restrictions based on geographic location.
I value that the answer is:
The request rate to Amazon S3 is too high.