Warning changes in Openssh 7.1.x or 7.5 .X
to summarize min changes in new package OpenSSH:
¤ DSA keys are not allowed by default for security reasons.
Please either use RSA keys or follow instructions in technote listed below
¤ To allow root to log in using a password, change the PermitRootLogin setting in /etc/ssh/sshd_config to this:
PermitRootLogin yes
Please read README file inclosed in each OpenSSh package specifically paragraph II) Addition Information
and technote