The Silent Database Conflict
postgres•Jan 8, 2026

The Silent Database Conflict

A PostgreSQL authentication error in a Node.js API using Docker Compose led to a surprising discovery: a native PostgreSQL installation on Windows was causing the issue due to a port collision.

devTo

devTo

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Key summary

A developer encountered a PostgreSQL authentication error in a Node.js API using Docker Compose, despite correct credentials. The issue was caused by a native PostgreSQL installation on Windows, which was bound to the same port as the containerized instance, leading to a port collision. The solution was to avoid default ports and update the application configuration to use a non-default port.

TL;DR

  • Port collisions can cause authentication errors in containerized services.
  • Native PostgreSQL installations on Windows can bind to default ports.
  • Docker containers do not win port ownership on Windows.
  • Avoid default ports for containerized services on developer machines.
  • Update application config to use non-default ports to prevent collisions.
  • Check PostgreSQL error paths for build and environment information.
  • PostgreSQL error paths can reveal the build and environment.
  • Update application config to use a non-default port to guarantee traffic reaches the intended PostgreSQL instance.
#postgres
#docker
#debugging
#wsl

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