We have recently gone through and replaced a number of our aging C650 Ironports with new X1070 security appliances. As these replaced in-production devices, they were configured with the same IP addresses and hostnames of the older one. When we have gone back to our M670 Managmenet Appliance, we are no longer retrieving reporting on the new devices. When we try to test connectivity to the devices in the security appliances feature, the M670 returns:
Error: The host key for X.X.X.X appears to have changed.
We have gone through the process of deleting the devices, commiting the configs, then re-adding. We have also issued new SSH keys for the admin user on both the M670 and the X1070's, as well as new keys for the logconfig. Neither removed the error. Normally in other SSH deployments, we would remove the older keys from the .ssh\known_hosts, but I have not found that option.