Issue website is down

[allmyurl]

website is showing Error 521: web server is down although my server is running as I am able to login plesk panel.

I did whitelist cloudflare ip as suggested but still getting problem.

Using awslightsail with plesk panel and cloudflare.

Please help.

 

[Dave W]

Try disabling F2B?

 

[allmyurl]

Thanks. Its working now.