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.

Solution 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

Solution 2

I was not qualified to post comment. So I added a new answer.

I encountered this problem on Mac OS X 10.10.3. And I had never installed/used Jekyll before. I was not able to start jekyll server with its default port number 4000. The reason was that the port was the same as what NoMachine used. With

$ sudo lsof -wni tcp:4000

Note: Running this command without sudo will have no output.

I saw this output:

COMMAND PID USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
nxd     449   nx    3u  IPv4 0x8d22************      0t0  TCP *:terabase (LISTEN)
nxd     449   nx    4u  IPv6 0x8d22************      0t0  TCP *:terabase (LISTEN)

The port 4000 was occupied by nxd, which was the process started by NoMachine. And

$ sudo kill -9 449

would not work, because NoMachine's nxd process would keep restarting, with a new PID.

Therefore, I had to either:

• Changed my jekyll server port in the site _config.yml to another spared one. I appended the line below to _config.yml and it worked.

  port: 3000 # change server port to 3000

or

• Changed NoMachine's default nxd port, or Uninstall NoMachine

Solution 3

Ctrl-Z doesn't terminate a program, but rather suspends it and sends it to the background. You can resume the program with the "fg" command. To actually terminate it, use Ctrl-C.

The actual error message seems to be bogus and can be ignored. I am getting the same error message "address in use" but jekyll works fine anyway at the expected port.

Solution 4

I have met this problem recently.

I tried out all the method mentioned above, and even restarted my computer, but still couldn't solve it!!! Then I removed the jekyll and installed a new version, it just worked.

gem uninstall jekyll & gem install jekyll (maybe you need super user priviledge).

If you really get annoyed with similar bugs, this sb method is worth a try...

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