Thin web server: `start_tcp_server': no acceptor (RuntimeError) after git branch checkout

Question

A Rails 3.2.0 app, working fine with Thin web server, both locally and on Heroku cedar stack.

After:

$ git branch work
$ git checkout work
$ rails se         


        

Answer 1

I had this error because I was already running rails in another terminal. Closing my other project fixed this.

Answer 2

Execute this in the terminal

sudo netstat -lpn |grep rails

And then

sudo kill <job id>

Answer 3

This works for me. Find (zombie?) server (can happen when quitting terminal with server running):

$ ps ax | grep rails

If it returns something like:

33467 s002 S+ 0:00.00 grep rails
33240 s003 S+ 0:15.05 /Users/Arta/.rbenv/versions/1.9.2-p290/bin/ruby script/rails s -p 3000

kill it, and run anew:

$ kill -9 33240
$ rails s

Answer 4

rvmsudo rails server thin -p 3000

Does it for me

Answer 5

I ran into a similar issue after getting back to the office from vacation. I run my server on the local IP as:

rails s thin -b <my_ip>

The problem was that my IP had changed, I just needed to use the new one.

Answer 6

The port 3000 may already be in use. Look at http://mrjaba.posterous.com/starttcpserver-no-acceptor-runtimeerror