Ugggggh. This is biting me too.
See:
http://sunsolve.sun.com/private-cgi/us/doc2html?bug/kernel/tcp-ip/4081315+87... 6654722
None of their proposed workarounds work here. And I don't know the current status of any more elegant workarounds or fixes.
See comp.unix.solaris for more details (especially posts from Casper Dik).
-- Dave Pascoe | mailto:dave@mathworks.com | Voice: 508.647.7362 KM3T | http://www.mathworks.com | FAX: 508.647.7002 PGP fingerprint: 53 AD 71 88 2F AA 45 AC D0 2E 68 91 71 77 39 AF