Hi Peter, thanks for your help.
I didn't know that with 0.0.0.0 al IPs are used on the machine.
Now is clear to me that there would be conflicts.
I followed your suggestion and assigned the IP of the machine to the jboss instance that would be accessed remotely, and 127.0.0.1 to the other instance.
Now everything works fine !
Thanks a lot.
Regards,
Gustavo.