server - Ruby on Rails - Address already in use - bind(2) for "0.0.0.0" port 3000 (Errno::EADDRINUSE) -


when attempt start rails server local machine, following error message. 

/users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/puma-3.9.1/lib/puma/binder.rb:269:in `initialize': address in use - bind(2) "0.0.0.0" port 3000 (errno::eaddrinuse) /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/puma-3.9.1/lib/puma/binder.rb:269:in `new' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/puma-3.9.1/lib/puma/binder.rb:269:in `add_tcp_listener' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/puma-3.9.1/lib/puma/binder.rb:105:in `block in parse' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/puma-3.9.1/lib/puma/binder.rb:88:in `each' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/puma-3.9.1/lib/puma/binder.rb:88:in `parse' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/puma-3.9.1/lib/puma/runner.rb:144:in `load_and_bind' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/puma-3.9.1/lib/puma/cluster.rb:391:in `run' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/puma-3.9.1/lib/puma/launcher.rb:174:in `run' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/puma-3.9.1/lib/rack/handler/puma.rb:69:in `run' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/rack-2.0.3/lib/rack/server.rb:297:in `start' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.3/lib/rails/commands/server.rb:104:in `start' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.3/lib/rails/commands/commands_tasks.rb:90:in `block in server' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.3/lib/rails/commands/commands_tasks.rb:85:in `tap' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.3/lib/rails/commands/commands_tasks.rb:85:in `server' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.3/lib/rails/commands/commands_tasks.rb:49:in `run_command!' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.3/lib/rails/commands.rb:18:in `<top (required)>' /users/zachdobbs/sample_app/bin/rails:9:in `require' /users/zachdobbs/sample_app/bin/rails:9:in `<top (required)>' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `load' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `call' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.2/lib/spring/client/command.rb:7:in `call' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.2/lib/spring/client.rb:30:in `run' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.2/bin/spring:49:in `<top (required)>' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `load' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `<top (required)>' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in `require' /users/zachdobbs/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in `require' /users/zachdobbs/sample_app/bin/spring:15:in `<top (required)>' bin/rails:3:in `load' bin/rails:3:in `<main>'

this error occurred , i'm not sure cause of be. when looked online noticed issue service running on port 3000, when try , run 'lsof -i tcp:3000' no results.

within puma.rb, define. 

port        env.fetch("port") { 3000 } rackup      defaultrackup port        env['port']     || 3000 environment env['rack_env'] || 'development'

when change port value such 8080 server run. confused why server not launch on port 3000. every command have attempted run has shown me no services running on port.

try following:

> sudo ps ax | grep rails #1338 pts/1    sl+    0:06 /usr/bin/ruby2.3 bin/rails c #1707 pts/0    rl+    0:07 /usr/bin/ruby2.3 bin/rails s  > sudo kill -9 1707  > rails s

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