Open TCP Port -> Write Bytes -> Wait-> Close Port = Nothing, Out?

David G. Miller dave at
Sat Jun 2 03:05:52 UTC 2007

Lance Drake <lance at> wrote:

> Hi Fedora Folks,
> Any idea why, when I successfully open a TCP:PORT connection - write  
> bytes into the port - wait PLENTY of time - Close Port - that nothing  
> leaves ?
> The exact same code (from within a duplicate JBoss deployment  
> situation) runs on my Mac system - but does not work on Fedora...  
> hmmmm...
> Any ideas on how to prove/locate where the bytes-ball gets dropped?
> Thanks!
> Lance Drake
iptables or selinux could be blocking what you're trying to do.  Put 
selinux into permissive mode if it isn't already, stop iptables and 
re-run your test.  If it still doesn't work, hmmm...  What is listening 
on that port that should be doing something with the incoming data?


Politics, n. Strife of interests masquerading as a contest of principles.
-- Ambrose Bierce

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