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2 stories

Banner: Node.js keep-alive timeout racing a load balancer idle timeout and causing ECONNRESET

Web Development Bug Report

Intermittent ECONNRESET and 502s: Node.js keepAliveTimeout vs load balancer idle timeout

Daniel Tran · Jul 9, 2025 · 9 min read

A low but stubborn rate of 502s at the load balancer and socket hang up errors between services turned out to be one race: Node closed idle keep-alive connections after 5 seconds while its callers kept reusing them.

Banner: idle WebSocket connection cut after 60 seconds by an Nginx proxy and load balancer timeout

Web Development Bug Report

WebSocket disconnects after 60 seconds idle behind Nginx and a load balancer

Daniel Tran · Apr 29, 2025 · 8 min read

Our live support chat dropped every connection that stayed quiet for a minute, with close code 1006 and no server error. Nginx's 60-second proxy_read_timeout and the load balancer idle timeout were closing idle sockets. A heartbeat plus proxy tuning fixed it.