Created attachment 111529 [details] This is the patch from the samba BZ that reportedly solved the problem
Description of problem: Samba mishandles plaintext passwords Using samba 3.0.10 on RHEL 3 as server (using unencrypted passwords and PAM auth) and a Win XP client machine. On initial attempt to connect, we've been seeing PAM auth failures that I've traced back to the server seeing password = username despite that not being the case on the wire (password is NULL as windows appears to be trying NULL before promtping for a password). https://bugzilla.samba.org/show_bug.cgi?id=2323
NEEDINFO_ENG has been deprecated in favor of NEEDINFO or ASSIGNED. Changing status to ASSIGNED for ENG review.