I have a mix of various RedHat and Fedora Systems in our network where we still use NIS. In nsswitch.conf, we use 'compat' mode for passwd, shadow, group. After doing two clean FC2 installs I noticed that any user with over 8 groups could not login. Doing a 'su - user' as one of these users would segfault. If I removed compat mode from nsswitch.conf, the problem would go away. However, on a FC2 test 3 box that I update to FC2 final, I did not have this problem. This helped me track the problem down to the pam_succeed_if line in /etc/pam.d/system-auth which did not exist on the upgraded box (why the update did not put this in I do not know). Removing the line from system-auth on the two clean install boxes fixed the problem. What exactly is the reasoning behind the pam_succeed_if line being added to system-auth anyway? -- --------------------------------------------------------------- Paul Raines email: raines@xxxxxxxxxxxxxxxxxxx MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging 149 (2301) 13th Street Charlestown, MA 02129 USA