Re: ssh: percent_expand: NULL replacement
If you have a rather robust ssh config file, add the following to the bottom of your file:
# Fix Leopard Issue with Null Replacement
Host *
IdentityFile ~/.ssh/id_rsa
You can also use id_dsa if that's your preference.
To generate a id_rsa/id_dsa file, use ssh-keygen.
Check the man file, 'man ssh-keygen', for the details.