If you're running *NIX you can see which process is listening on port 3000 
by running lsof -i :3000

You can also change the port you want your rails server to listen to with 
the -9 option.

For example : rails server -p 8080 will listen on port 8080.

On Friday, December 27, 2013 6:45:17 AM UTC+1, pavey nganpi wrote:
>
> i have restarted my pc but i still have the same pb, i wasnt able to fins 
> the process which was running,thanks
>
> On Thursday, December 26, 2013 11:41:45 PM UTC-5, pavey nganpi wrote:
>>
>> rails server                                                             
>>                                           
>> => Booting WEBrick                                                       
>>                                           
>> => Rails 4.0.2 application starting in development on http://0.0.0.0:3000    
>>                                      
>> => Run `rails server -h` for more startup options                         
>>                                          
>> => Ctrl-C to shutdown server                                             
>>                                           
>> [2013-12-26 23:29:07] INFO  WEBrick 1.3.1                                 
>>                                          
>> [2013-12-26 23:29:07] INFO  ruby 2.0.0 (2013-11-22) [i386-mingw32]       
>>                                           
>> [2013-12-26 23:29:07] WARN  TCPServer Error: Only one usage of each 
>> socket address (protocol/network address/po    
>> rt) is normally permitted. - bind(2)                                     
>>                                           
>> Exiting                                                                   
>>                                          
>> C:/Ruby200/lib/ruby/2.0.0/webrick/utils.rb:85:in `initialize': Only one 
>> usage of each socket address (protocol/    
>> network address/port) is normally permitted. - bind(2) 
>> (Errno::EADDRINUSE)                                         
>>         from C:/Ruby200/lib/ruby/2.0.0/webrick/utils.rb:85:in `new'       
>>                                          
>>         from C:/Ruby200/lib/ruby/2.0.0/webrick/utils.rb:85:in `block in 
>> create_listeners'                          
>>         from C:/Ruby200/lib/ruby/2.0.0/webrick/utils.rb:82:in `each'     
>>                                           
>>         from C:/Ruby200/lib/ruby/2.0.0/webrick/utils.rb:82:in 
>> `create_listeners'                                   
>>         from C:/Ruby200/lib/ruby/2.0.0/webrick/server.rb:132:in `listen' 
>>                                           
>>         from C:/Ruby200/lib/ruby/2.0.0/webrick/server.rb:113:in 
>> `initialize'                                       
>>         from C:/Ruby200/lib/ruby/2.0.0/webrick/httpserver.rb:45:in 
>> `initialize'                                    
>>         from 
>> C:/Ruby200/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib/rack/handler/webrick.rb:11:in
>>  
>> `new'                
>>         from 
>> C:/Ruby200/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib/rack/handler/webrick.rb:11:in
>>  
>> `run'                
>>         from 
>> C:/Ruby200/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib/rack/server.rb:264:in 
>> `start'                      
>>         from 
>> C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.0.2/lib/rails/commands/server.rb:84:in
>>  
>> `start'         
>>         from 
>> C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.0.2/lib/rails/commands.rb:76:in
>>  
>> `block in <top (req    
>> uired)>'                                                                 
>>                                           
>>         from 
>> C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.0.2/lib/rails/commands.rb:71:in
>>  
>> `tap'                  
>>         from 
>> C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.0.2/lib/rails/commands.rb:71:in
>>  
>> `<top (required)>'     
>>         from bin/rails:4:in `require'                                     
>>                                          
>>         from bin/rails:4:in `<main>'                                     
>>                                           
>>
>

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