There is a known bug in the SunOs 4.0.3 portmapper that may be the source
of your problems. Sun does have a patched version available, but you have
to ask for it. Sorry, I can't find the reference number.
David LeVine
AT&T: 408-721-5317
ARPA: levine at dtg.nsc.com
Uucp: {sun,apple}!nsc!dtg!levine