After restarted server, all the websites appear 502 error

I have restarted my server from my panel. However, after that, all of the websites cannot be visited and they appear 502 errors. Could you help?

I just restarted my server from my server panel, but when I visit the server panel again, I noticed that I cannot open the link. Then I tried to visit my other sites, however, the 520 errors happens, only 1 of the website can be visited.

A 502 error likely means that cloudflared on your server failed to connect to the origin service.

I wonder if your iptables or firewall might be the cause? :thinking:

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