openssh reading only SOME ssh1 hostkeys from ssh.com ssh

[Phil Dibowitz]

Hey folks, I've asked this on the security focus mailing list, but no 
one seems to know...

I'm in the process of moving my company from old crufty ssh.com ssh1 to 
openssh.

On most of our hosts, we've created rsa and dsa keys but managed to KEEP 
the old rsa1 key...

However, on a few hosts, openssh has been unable to read the old rsa1 
key and has claimed:

   debug1: Unsupported cipher 1 used in key file /etc/ssh/ssh_host_key.
   Could not load host key: /etc/ssh/ssh_host_key

Does anyone know why it is that openssh has this problem only sometimes, 
and if there is a way to fix it?

Thanks,
-- 
Phil Dibowitz                             phil at ipom.com
Freeware and Technical Pages              Insanity Palace of Metallica
http://www.phildev.net/                   http://www.ipom.com/

"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
  - Benjamin Franklin, 1759