When some of our customers websites had this, it were actually internal problems with the webserver service (nginx) connecting to PHP processes via UNIX sockets. One time it was a permission problem and another time the server was targeted by aggressive crawling and several internal limits prevented enough processes to be available to connect to. So the “gateway” is probably the socket or its connection.
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When some of our customers websites had this, it were actually internal problems with the webserver service (nginx) connecting to PHP processes via UNIX sockets. One time it was a permission problem and another time the server was targeted by aggressive crawling and several internal limits prevented enough processes to be available to connect to. So the “gateway” is probably the socket or its connection.