Seems that each system is making up it own id's. Both the centos and fedora systems have the same idmap settings.
idmap uid = 3000000-4000000 idmap gid = 3000000-4000000 samba 3.5.5 winbind and nss on fedora 13 workstation uid=3000000(jonnt) gid=3000004(domain users) groups=3000004(domain users),3000005(domain admins),3000006(denied rodc password replication group),3000007(vpn),3000006(denied rodc password replication group),16777216(BUILTIN+administrators) samba 3.5.5 winbind and nss on centos 5.5 file server uid=3000000(jonnt) gid=3000000(domain users) groups=3000000(domain users),3000001(domain admins),3000002(denied rodc password replication group),3000003(vpn),3000002(denied rodc password replication group) samba 4 DC and file server with nss on centos 5.5 x86_64 uid=3000011(jonnt) gid=100(users) groups=100(users),3000009(Domain Admins),3000015(VPN) Jonn Taylor -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba