title: Thin behind Nginx "no live upstreams while connecting to upstream"
body: <p>I am getting this error in maybe one out of 50-100 requests.  I am running 10 Thin instances behind nginx and I don't think that my load is high enough to max out the usage in all 10 instances.. and I would expect nginx to wait even if all instances were busy (maybe not??).  Has anyone else seen this before?  I am trying to figure out a good way to debug it.</p>
  
  <p>Here is my setup:
  CentOS 5.5 on Rackspace Cloud Servers 2GB instance
  nginx 0.7.67
  Thin 1.2.7
  Rails 3RC
  Ruby 1.9.2rc2</p>
  
  <p>Nginx and 10 Thin instances are running on the same server.  </p>