You might want to check for new/changed options from 6.6

https://www.openssh.com/releasenotes.html#7.4

Pat

On 08/25/2017 11:20 AM, Gilbert E. Detillieux wrote:
> I was relying on host-based authentication (using RSA keys) between 
> hosts in a cluster, and since the latest update to openssh under SL7, 
> that seems to no longer work.  These are the specific packages that 
> were installed as part of the recent yum update:
>
> openssh-7.4p1-11.el7.x86_64.rpm
> openssh-askpass-7.4p1-11.el7.x86_64.rpm
> openssh-clients-7.4p1-11.el7.x86_64.rpm
> openssh-server-7.4p1-11.el7.x86_64.rpm
>
> Any ideas why this stopped working?  Any ideas what I need to tweak to 
> get it working again?
>

-- 
Pat Riehecky

Fermi National Accelerator Laboratory
www.fnal.gov
www.scientificlinux.org