/usr/bin/login Terminal start gives error

Question

When i try to start up the terminal via standard /usr/bin/login, i get the following error:
login: PAM Error: Module is unkown
only been a problem since 10.4.6 update. Already repaired permissions.
I can change the shell command to bash, and it works. But if i try to run a "sudo" command, i get same PAM Error.
I'm quite stuck here.
The other weirdness is that I can't ssh into this machine from anywhere else. All of the system preferences are set correctly.
Not sure if this is a different problem, or symptom of the same problem.
Any ideas?
iMac G4 FP   Mac OS X (10.4.6)  

Answer 1

The line that you commented out at Gary's suggestion should be commented out. it's just there to remind you of what goes in which column.
With the line commented out:
# login: auth account password session
Are you still getting the error message that you initially were?
if so, verify the the modules exist.
they should exist under /usr/lib/pam
ls -l /usr/lib/pam
total 280
-r--r--r-- 1 root wheel 9348 Mar 20 2005 pam_afpmount.so
-rwxr-xr-x 1 root wheel 8392 Mar 20 2005 pam_deny.so
-r--r--r-- 1 root wheel 18456 Mar 20 2005 pam_netinfo.so
-rwxr-xr-x 1 root wheel 8560 Mar 20 2005 pam_nologin.so
-rwxr-xr-x 1 root wheel 8476 Mar 20 2005 pam_permit.so
-rwxr-xr-x 1 root wheel 8452 Mar 20 2005 pam_rootok.so
-rwxr-xr-x 1 root wheel 8748 Mar 20 2005 pam_securetty.so
-r--r--r-- 1 root wheel 8620 Mar 20 2005 pam_securityserver.so
-r--r--r-- 1 root wheel 8732 Mar 20 2005 pam_unix.so
-r--r--r-- 1 root wheel 8492 Mar 20 2005 pam_uwtmp.so
-rwxr-xr-x 1 root wheel 8900 Mar 20 2005 pam_wheel.so
some have configuration files. On linux they're stashed under /etc/security. but OS X, seems to want to place them else where. judging from the output of
strings run again, pam_securetty.so, it's looking for it's configuration file under /etc.
a tad dated, and it doesn't cover all of the modules that are available, but
it may give you a better understanding of PAM.
The Linux-PAM System Administrators' Guide
Andy