Site displays 521 error for half a year already

Whenever we access the site the site is dead and never came back ever since… And we don’t know why… Help me…

The site is a subdomain.
Server is AWS.

Search, as the prepopulate text suggested -> https://community.cloudflare.com/search?q=521%20tip

I was not the one who set up the server, and do not know where to configure :frowning:

In that case it is best if you contact the person responsible for that.

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