It seems that Samba 3.5 has problems binding its socket when running on dual-stack Linux systems. This is what I am seeing in log.smbd, right after starting Samba:
Tags: samba
Recently I have been migrating a Samba PDC and BDC from RHEL 4 to SLES 10 SP1. Everything went pretty well, until I started configuring the printers on the new Samba servers.