/dev/null altered, ssh, and security

[Reza Roboubi <reza@parvan.net>]

I've had exactly this problem and this solution worked:
http://groups.google.com/group/linux.debian.user/browse_frm/thread/2e1954d22cbe441d/62571302f1c3dfaa?lnk=st&q=sshd+%22fatal+daemon+failed+success%22&rnum=6#62571302f1c3dfaa

Now I wonder why /dev/null was altered?  Could other things have 
changed?  Do I need a full reinstall to be sure?

Reza.