I am Running openssh 3.4p1 on Tru64 v5.0a.

  In my system logs, I see the following when I ssh to that machine
with 'ssh -X system_name':

        error: getaddrinfo: servname not supported for ai_socktype

  Any idea what that could be?  I can get in okay, but X11 forwarding
isn't working, although sshd_config has it enabled.

  I had a somewhat same type of error initially when I installed ssh on top
of openssh 3.1p1 - running 'ssh hostname' gave me :

        ssh: hostname: servname not supported for ai_socktype

I got rid of that ERROR by putting :  ssh       22/tcp into my
        /etc/services.