504 Gateway Time-out on eu-central-1AMI install

Issue Summary

Installed AMI on US-west, all works fine. Installed on eu-central-1, SSH works fine, but gets 504 on http connection.
Please advise.

A summary of the issue and the browser/OS environment in which it occurs.

Technical details:

• Redash Version: 5.0.2
• Browser/OS: All Mac browsers
• How did you install Redash: AWS eu-central-1AMI install

Upgraded to t2.small, now works.