![]() Nginx depends on backend services like PHP-FPM, database services and cache servers to run web applications. We’ve listed the top 5 reasons for 502 Bad Gateway error, and how we fix them. ![]() You know something is messed up, because it says “ failed” and “ refused“.īut WHAT? You hardly have time to get a PhD in computer science. So, many web masters roll up their sleeves and look at the error log:Ĥ 08:34:43 949#949: * 7 connect() failed (111: Connection refused) while connecting to upstream, client:, server:, request: "GET /myurl-this/ HTTP/1.0", subrequest: "/redis-fetch", upstream: "redis://127.0.0.1:6379", host: "", referrer: "" 3 word error message – because Nginx doesn’t love you.
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