No. Normally, from 'clustermode' you can then access machine level on the different appliance(s) in cluster. But, if this is disconnected, then that command is not going to work.
If you cannot SSH/telnet to the appliance in question, and do not have some form of remote console or access pre-configured, you will need to connect directly to the appliance, or hard boot the appliance in order to attempt to regain connectivity.
Please see the C670 quick start guide for assistance:
http://www.cisco.com/c/dam/en/us/td/docs/security/esa/hw/C670_QSG.pdf
Setup and Management
•• For access by Ethernet™, connect to the Management Network
Port. Use a browser to access the web-based interface on the
default IP address 192.168.42.42. You can also access the
command line interface by SSH or terminal emulation software
on the same IP address. (The netmask is /24.)
•• Or, for Serial access, connect to the Serial Port. Access the command
line interface by a terminal emulator using 9600 bits, 8 bits, no parity,
1 stop bit (9600, 8, N, 1), flowcontrol = Hardware.
I hope this helps!
-Robert
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