Hi, On redhat 6.2, I have been using pam_start(), pam_authenticate() calls for user authentication, with /etc/pam.d/pam_pwdb.so specified in service file. It works great. Now moving to Redhat 7.0, this still works. However if I switch to /etc/pam.d/pam_stack.so, I get an PAM_AUTH_ERR. Anyone knows why? Should I stay with pam_pwdb.so (the document seems to suggest using pam_stack.so)? Thank you very much. sliu@egenera.com P.S.: I'm not in the mailing list. please send reply to my email address.