HP-UX ftp.rb:292:in `addr': getnameinfo: address family not supported (SocketError)

Hi all,
after I successfully installed ruby 1.8.7 on HP-UX 11.23 IA64 I was
trying to use Net::FTP class when I got this error:

/usr/local/lib/hpux64/ruby/1.8/net/ftp.rb:292:in addr': getnameinfo: address family not supported (SocketError) from /usr/local/lib/hpux64/ruby/1.8/net/ftp.rb:292:inmakeport’
from /usr/local/lib/hpux64/ruby/1.8/net/ftp.rb:328:in
transfercmd' from /usr/local/lib/hpux64/ruby/1.8/net/ftp.rb:424:inretrlines’
from /usr/local/lib/hpux64/ruby/1.8/monitor.rb:242:in
synchronize' from /usr/local/lib/hpux64/ruby/1.8/net/ftp.rb:422:inretrlines’
from /usr/local/lib/hpux64/ruby/1.8/net/ftp.rb:631:in `list’
from ./mauro.rb:11

It happens when I use ftp.list

Did you already face this problem?

Thank You

Regards

Mauro