Telnet and RSH are disabled in the predefined management firewall policy (mgmt). To enable the cluster to accept Telnet or RSH requests, you must create a new management firewall policy that has Telnet or RSH enabled and then associate the new policy with the cluster management LIF.
cluster1::> system services firewall policy clone -policy mgmt -new-policy-name mgmt1
cluster1::> system services firewall policy create -policy mgmt1 -service telnet -action allow -ip-list 0.0.0.0/0
cluster1::> system services firewall policy create -policy mgmt1 -service rsh -action allow -ip-list 0.0.0.0/0
cluster1::> network interface modify -vserver cluster1 -lif cluster_mgmt -firewall-policy mgmt1