[gentoo-user] can not ssh over vpn

I've setup openVPN and it is working.  But when I try to login to remote
PC.

ssh fd@192.168.140.7
Password:
Password:
Password:
fd@192.168.140.7's password:
Permission denied, please try again.
fd@192.168.140.7's password:
Received disconnect from 192.168.140.7: 2: Too many authentication failures
Disconnected from 192.168.140.7

I've setup rsa keys and copy my public key to remote PC.  When I connect
the remote PC on my local network I can ssh to it without any password OK.
But when I setup the connection over OpenVPN the remote PC is asking for
password even though the remote PC sshd.conf has:

PasswordAuthentication no

I've tried to look at log on remote PC
cat /var/log/auth.log |grep -i ssh

but the are no errors.
It keep saying:
sshd: Accepted publickey for fd from 10.0.0.100 (this is my box)

What else to look for?

-- 
Thelma