Using authorized_keys2 hasn't been a good idea for a long time. See /usr/share/doc/openssh-server/NEWS.Debian.gz:
openssh (1:3.0.1p1-1) unstable; urgency=high
As of version 3, OpenSSH no longer uses separate files for ssh1 and ssh2
keys. This means the authorized_keys2 and known_hosts2 files are no longer
needed. They will still be read in order to maintain backward
compatibility.
-- Matthew Vernon <email address hidden> Thu, 28 Nov 2001 17:43:01 +0000
See also http:// bugs.debian. org/cgi- bin/bugreport. cgi?bug= 221675; I couldn't link to both in the Debian bug link.
Using authorized_keys2 hasn't been a good idea for a long time. See /usr/share/ doc/openssh- server/ NEWS.Debian. gz:
openssh (1:3.0.1p1-1) unstable; urgency=high
As of version 3, OpenSSH no longer uses separate files for ssh1 and ssh2
keys. This means the authorized_keys2 and known_hosts2 files are no longer
needed. They will still be read in order to maintain backward
compatibility.
-- Matthew Vernon <email address hidden> Thu, 28 Nov 2001 17:43:01 +0000