Dear list, there has been some discussion about a specific version of some PAM libraries being buggy in the past. This bug led to the error message "Module is unknown" when trying to do a passwd. Unfortunately, this is the same for sshd, so I cannot log into the machine any more. I can only boot it from a rescue system, mount the root filesystem and chroot then. The problem occured after I did some updates to the system. I am not sure, but I think I changed libc6 to a newer version. But I did not touch libpam* or anything in /lib/security. Q1: How can I debug what's wrong? Might the libc6 version have an impact? What is the difference between libc and glibc? Q2: If I switch sshd from password authentication to public / private key, does this surpass PAM so I cat at least get in again and work this out later? Torsten _______________________________________________ Pam-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/pam-list