The management server /etc/opt/sun/n1gc/ssh_known_hosts file contains the name, IP address, and encrypted access keys for SSH-accessible servers. A stale or obsolete entry for a server in the /etc/opt/sun/n1gc/ssh_known_hosts file prevents SSH access to that server. The solution is to remove the entry for server from the /etc/opt/sun/n1gc/ssh_known_hosts file as follows.