Port already in use? How to fix it when your AI coding agent keeps starting servers
This story is from 2026-10-21. It is preserved in the archive; the latest stories are on the live feed.
You ask your AI coding agent to run the app, and you get this: Error: listen EADDRINUSE: address already in use :::3000 Or worse, you don't get an error at all. The agent's server quietly starts on 3001, your browser is still on 3000, and you spend ten minutes wondering why your change isn't showin…
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- 2026-10-21 12:41 · DEV Community — AI
Port already in use? How to fix it when your AI coding agent keeps starting servers