postmaster on solaris

Hi all,
is there someone who has already tried to start the postmaster on Sun
solaris with 1024 backends ?
If yes, what is the best configuration for the /etc/system file ?

I set the following configuration :

set shmsys:shminfo_shmmax=0x7fffffff
set shmsys:shminfo_shmmin=1
set shmsys:shminfo_shmmni=512
set shmsys:shminfo_shmseg=512
set semsys:seminfo_semmap=512
set semsys:seminfo_semmni=1024
set semsys:seminfo_semmns=1024

The database server starts,but it seems that there is a socket problem
when creating a pool of jdbc connections (up to 512)
The system is not enable to create any more java sockets on the same JVM
and exceptions are thrown : java.net.UnknownHostException

I'm using postgresql-7.0.2 on solaris 5.8.

Thank you in advance

Alain