[Samba] Samba with ipfilers and NAT

[ben]

i am running freebsd stable with ipfilter and NAT is there anything that i
have to do different with the smb.conf file to be able to mount a windows
share
mount_smbfs //user at server/share_name /path/to/mountpoint
and everytime i get this message
mount_smbfs: can't get server address: ssyerr = operation timed out
is there something that i am missing
i can ping the windows box and i have tried the ip as the server name and
that still will not work i have also put the windows name in the /etc/hosts
file and the same thing keeps happening i can access the samba shares from
windows fine
before i put ipfilters and NAT on everything worked great

thanks for your help
Ben