Isilon not working when Node-1 and Node-2 goes offline

Hi,

I have EMC Isilon simulator setup with a total of 3 nodes. On this setup, Node-2 is not working due to some issues with IP address that's why it is always offline.

Node-1 192.168.1.67 

Node-2 192.168.1.68 9 (always offline)

Node-2 192.168.1.69

In this case, I have observed that when first node-1 goes offline then it is not allowing me to log in to Node-3. It gives the 'Service Unavailable' error also it fails when I try to run the API on Node-3.

Is it because Node-1 (node with the lowest NodeID) is a Master node and if this node goes off then the connection to other nodes is broken?  

In such cases, which node should I consider the main node?

I'm working on the automated script to monitor the Isilon environment and collect Capacity information. I really need help here because script is unable to fetch any details because of the above problem. 

Also, while Isilon deployment I have observed that when you set authentication credentials to the Fist Node then the same credentials apply for all nodes in the cluster. Is it a valid case or there is a possibility that the credentials of each node might be different? 

 

Thanks in advance

 

Attaching UI error screenshots 

UI-Error1UI-Error2