The IP addresses associated with the slogin-serv* servers is changing as they are moving to a subnet for machines using NFS sec=sys. This may cause ssh to warn that that the IP address differs, but that the host key matches. This is not a problem, so type “yes” to connect.
ra4:~: ssh slogin-serv0
Warning: the RSA host key for ‘slogin-serv0′ differs from the key for the IP address ’126.96.36.199′
Offending key for IP in /etc/ssh/ssh_known_hosts-out:726
Matching host key in /etc/ssh/ssh_known_hosts-out:1370
Are you sure you want to continue connecting (yes/no)? yes
Last login: Sun Oct 10 19:54:02 2010 from ramsey.cl.cam.ac.uk