Symptom
An S3 Sidekick connection cannot list a bucket, authenticate, or start a transfer.
Check
Verify the endpoint URL, region, bucket name, access key, secret key, and network route. Confirm that the key has the required bucket permissions and that the provider accepts the addressing mode you selected.
Resolution
- Edit the connection and correct one field at a time.
- Test the connection after saving the change.
- Check the provider status page and local firewall or VPN when the request times out.
- Re-enter a rotated key and remove the old credential from the saved connection.
- Retry a transfer only after a bucket listing succeeds.
Expected result
The connection lists the intended bucket and a small test action succeeds. A successful connection still exposes only the permissions granted by the provider.
Escalation
Include the provider, package version, endpoint hostname, region, and error code. Never send a secret key, session token, or full authorization header.