[other] openssh_7 key based access to openssh_5 server

Hey;

I just upgraded my ubuntu laptop to ubuntu 16.04 which went very smoothly as all previous updates have. Openssh_7 turned off support for DSA keys so I'm off to create a new RSA key for myself. I generated the key pair and can use it to access accounts on my laptop w/o issue; however, I cannot access a Centos 6.8 system running openssh_5.3. The key isn't being accepted:

Code:

$ ssh -i ./id_rsa fw
Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

Permissions are set correctly as proven by the fact that I can access accounts locally w/o issue:

Code:

$ ssh localhost hostname
Enter passphrase for key '/home/dkoleary/.ssh/id_rsa': 
oleary1

I suspect it's a difference in the key encryption as the key fingerprint on the openssh_7 system doens't look the same as it does on the openssh_5 box:

Code:

$ ssh-keygen -lf ./id_rsa
2048 SHA256:OWiBtrNCcrw3w4dHsT81R5UNpf6D618XzyGgK8OWXfc dkoleary@oleary1 (RSA)
$ exit
Connection to 192.168.12.146 closed.
$ head -1 /home/dkoleary/.ssh/authorized_keys | kf
b1:f3:e3:15:b2:87:10:42:d2:19:72:d8:41:8e:09:4e oleary1          dkoleary@oleary1

Those are the exact same keys...

Has anyone into this and know how to get around it? My google-foo is weak today as I haven't been able to find any mention of it.

Thanks for any help/hints/tips/suggestions.

Doug O'Leary

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[other] openssh_7 key based access to openssh_5 server