> Does your /etc/hosts contain an entry for localhost?

Yes

> I remember seeing issues where not being able to (reverse)resolve the hostname of the IP address caused problems.

Bingo!
The problem was the hostname (servidor.XXXXXXXX.com.br) was not listed in hosts file.

I did check the hostname:

# uname -a
Linux servidor.XXXXXXXX.com.br 2.6.20-1.2320.fc5 #1 Tue Jun 12 18:50:38 EDT 2007 i686 i686 i386 GNU/Linux

And then checked /etc/hosts file:

# cat /etc/hosts
127.0.0.1 localhost XXXXXXXX.dyndns.org

And figured out that 'servidor.XXXXXXXX.com.br' wasn´t there.

After change /etc/hosts file, everything works:

# cat /etc/hosts
127.0.0.1 localhost XXXXXXXX.dyndns.org servidor.XXXXXXXX.com.br

Thanks for the help.

Is this problem related to Java or to Jaybird itself?

Regards,

Fabiano.