"Server error (502)" or "Server error (504)" during publication
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"Server error (502)" or "Server error (504)" during publication

These errors can occur during publication if nginx server is used for website builder. Usually, the reason is script timeout. Increase timeout for nginx script execution (parameter fastcgi_read_timeout), restart nginx server and check if error was resolved.

If nginx server is used as proxy server for Apache, then increasing these parameters in nginx configuration may help to solve the problem:
proxy_connect_timeout, proxy_send_timeout, proxy_read_timeout, send_timeout

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