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Setting up Rails app in Ubuntu machine (RVM + Sidekiq + Nginx + Puma + Capistrano) | by David Mauricio | Medium
Cannot connect to a rails development server on custom port in Puma 3.7.0 · Issue #1207 · puma/puma · GitHub
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Address already in use – bind(2) for “127.0.0.1” port 3000 (Errno::EADDRINUSE) | Check what process is running in your localhost – C B
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