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502 Bad Gateway

A proxy or load balancer could not get a valid response from the application behind it.

What causes it

PHP-FPM, Node or a container has crashed.
The upstream address or port is wrong after a deploy.
The application is too overloaded to answer.

If you are the visitor

Nothing you can fix from your side; reload in a minute.

If it is your website

Check the application process is alive, and read its log rather than the proxy log.
Verify the upstream configuration.
Restart the service, then investigate why it died.

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Other connection errors

ERR_CONNECTION_REFUSED DNS_PROBE_FINISHED_NXDOMAIN ERR_NAME_NOT_RESOLVED ERR_CONNECTION_TIMED_OUT ERR_SSL_PROTOCOL_ERROR NET::ERR_CERT_AUTHORITY_INVALID NET::ERR_CERT_DATE_INVALID NET::ERR_CERT_COMMON_NAME_INVALID ERR_TOO_MANY_REDIRECTS ERR_EMPTY_RESPONSE ERR_CONNECTION_RESET 503 Service Unavailable This site can't be reached