We are planning an OS upgrade from 5.3 to 7.1. The server in question is a hub for files coming in and going out via sftp, using ssh keys. Do I need to take any precautions regarding authorized_keys and known_hosts?
You might consider downloading only the openssh Version matching the one contained in the AIX 7.1 package and install it on a Testsystem so you can figure out whether it is behaving differently or not before you upgrade the whole OS ...
I always use the copy variant because the first was not OK
An alternative way to work around this problem (after the fact) would be to restore the original ssh_host_key* files from a backup. For example, I copied the original ssh_host_key* files to my home directory before starting the AIX migration.
and with smitty nimadm_migrate no problem from AIX 5 to AIX 6.1 or 7.1.
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