TCPServer Error: Address already in use - bind(2)

Question

Jekyll was working fine for me few weeks back but now all of a sudden it gives me the following error:

TCPServer Error: Address already in use - bind(2) INFO  WEBrick::HTTPServer#start: pid=7300 port=4000   % lsof -i :4000  <fetches nothing> 

Even though nothing is running on the port. Below are the details:

 % jekyll --version Jekyll 0.11.2  % where jekyll /home/bhaarat/.rvm/gems/ruby-1.9.2-p290/bin/jekyll /usr/bin/jekyll  % ruby --version ruby 1.9.2p290 (2011-07-09 revision 32553) [i686-linux]  % rvm --version rvm 1.10.0  

Here is the output

 % jekyll --server Configuration from /home/bhaarat/blog/omnipresent.github.com/_config.yml Auto-regenerating enabled: /home/bhaarat/blog/omnipresent.github.com -> /home/bhaarat/blog/omnipresent.github.com/_site [2012-04-21 13:46:40] regeneration: 38 files changed [2012-04-21 13:46:40] INFO  WEBrick 1.3.1 [2012-04-21 13:46:40] INFO  ruby 1.9.2 (2011-07-09) [i686-linux] [2012-04-21 13:46:40] WARN  TCPServer Error: Address already in use - bind(2) [2012-04-21 13:46:40] INFO  WEBrick::HTTPServer#start: pid=7382 port=4000 

I know the address isn't in use and jekyll is probably breaking for some other reason but throwing that error. What are my options? I've tried re-installing as well.

Answer 1

Type this in your terminal to find out the PID of the process that's using the 3000 port:

$ lsof -wni tcp:3000 

Then, use the number in the PID column to kill the process:

$ kill -9 PID