Yippeee.... Trouble shooted source from https://engage.eucalyptus.com/customer/portal/questions/342904-euca-describe-availability-zones-verbose-availabilityzone

Solution

If Free/Max value is 0000/0000 for all then
a) CC not able to communicate to NC, Just test with ping <ip of node>
b) Time-value difference between CC and NC – correct with ntp
c) Password less login to NC is lost – redo ssh-copy-id
d) Already registered Ips or Keys of either CC or NC have changed
e) If none works, then regenerate the credentials using
sudo euca_conf --get-credentials <newname>.zip
unzip it and source eucarc
Transfer the zip file to NC and source eucarc there too.