Mongrel not starting: `initialize_without_backlog': Cannot assign requested address - bind(2) (Errno

I have a rather strange problem with mongrel and I would be grateful if
anyone could assist me with resolving.

I have an application running mongrel 1.1.1 and rails 1.2.5 with ruby
It was all working fine and starting as expected. But I did a server
once and mongrel has refused to start up since. I get the following

initialize_without_backlog': Cannot assign requested address - bind(2) (Errno::EADDRNOTAVAIL) from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.1/bin/../lib/mongrel/tcphack.rb:12:ininitialize’
from /usr/lib/ruby/1.8/drb/drb.rb:865:in open' from /usr/lib/ruby/1.8/drb/drb.rb:865:inopen_server’
from /usr/lib/ruby/1.8/drb/drb.rb:759:in open_server' from /usr/lib/ruby/1.8/drb/drb.rb:757:ineach’
from /usr/lib/ruby/1.8/drb/drb.rb:757:in open_server' from /usr/lib/ruby/1.8/drb/drb.rb:1339:ininitialize’
from /usr/lib/ruby/1.8/drb/drb.rb:1627:in new' ... 31 levels... from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.1/bin/../lib/mongrel/command.rb:212:inrun’
from /usr/bin/mongrel_rails:16:in `load’
from /usr/bin/mongrel_rails:16

Initially I though that it was due to the fact that somehow there were
processes that were holding onto the ports so I did a netstat to check
listening processes. However there were no processes holding onto the

I suspect that it is something that is in the configuration for that
particular application because there are other applications on the
which are still working fine.

Has anyone else experienced this before and what was the resolution.

Nii Amon

Hi Nii,

Looks like something else is already running on the port that Mongrel
3000 by default. See if you have any other mongrels running (ps -ef) or
better yet, bring up http://localhost:3000 and see what’s running.


Hi Michael
I can verify that there is no other application on that port: I setup a
dummy app on the server and started it on the port 3013 which my app is
trying to access. That worked without any problems. Therefore I think
it is something more to do with my own app than perhaps with a held

Nii Amon

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