Fix AWS Lightsail 522 Error - Site is down

Hi Guys,

We have the attached error on our woocommerce / Cloudlfare / AWS Lightsail hosting.
It started at 9am ACDT time and its now 8:25am Friday 31.12.21 and its still down.
I believe this is simple fix but need quick help.
We may also need some ongoing help in the future for these types of issues.
Experience need:

AWS - Lightsail or EC2
Cloudflare
Wordpress with Woocommerce

I am online and can be contacted now.
Regards,
Chris