Thanks for your reply.
Access denied through ssh.
I just found something interesting. We have a FAS8020 cluster and a FAS2552 cluster. The FAS8020 cluster has a SVM created and the FAS2552 has not yet. The OnCommand system Management shows the IPs of the two clusters. The problem is the IP of the FAS2552 cluster (which I use it for ssh) and the IP for the FAS8020 SVM network interface are the same. Can this be the problem? Can I change the SVM IP in System management in the production envirnment?