All flows have disappeared on AWS hosted system

[Colin]

Any node-red accessible from the internet without requiring credentials to get in is liable to be hacked. There are bots out there looking for them. You will have to rebuild the whole system I am sorry to say, and put it down to a learning exercise.

Then read this FAQ post for advice on how to safely access node-red over the internet.

Safely accessing Node-RED over the Internet

NOTES: This is a large and complex subject. So this FAQ is likely to be a work-in-progress for some time. This FAQ MUST NOT be taken as gospel or as professional advice. The information is shared in good faith but with no guarantees. Get the input of professionals and get your system regularly security tested, at least penetration tested. Please feel free to add suggestions for content and links to existing resources. Overview of options There are two main options for making Node-RED endpoi…