Nginx2 solutions
Nginx Errors and Solutions
Web server configuration, SSL, and reverse proxy problems
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Problem Type
networking
Difficulty
intermediate
Nginx 502 Bad Gateway: Causes and Fixes
VerifiedNginx cannot connect to the upstream server or the upstream server is not responding.
502 Bad GatewayUpdated 9/14/2026
Nginx Connection Refused: Causes and Fixes
VerifiedNginx cannot connect to upstream server because it's not running or not accepting connections.
connect() failed (111: Connection refused) while connecting to upstreamUpdated 9/14/2026