This site cant be reached - after being used for a long time

[erez3]

Hi all
i have a site (running on aws ec2) for which the domain dns is in cloudflare.
this site has been in use for many months without any errors till today.
suddenly its not accessible any more. i get “this site cant be reached” both in chrome and edge (with " xxxx unexpectedly closed the connection" comment)

any suggestions as to what has changed/where to look for it?
thanx in advance,
ErezM

[cloonan]

@system

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