I am pleased to report that I have samba v4.0.0alpha13 working successfully with RHEL v6-beta Linux 2.6.32-19.el6.x86_64 and bind v9.8.0a1. So far I have tested it against WinXP and Win7 clients with no issues. Thank you for the hard work that has gone into project so far! Take care, Benjamin Donnachie