I should probably have told that the 64-bit machine in question is running Fedora 7 x86_64 with samba-3.0.25b-2.fc7.x86_64 samba-common-3.0.25b-2.fc7.x86_64 samba-common-3.0.25b-2.fc7.i386 winbindd is in the first package and the latter two contain the 64-bit and 32-bit variants of pam_winbind.so Pim