Hi @lalprasanth ,
This error in screenshot indicates that while adding a new node in the cluster, the new node is not able to reach to CM server on port 7182 and the request timed out.
Make sure that port 7182 is open. Test from new node if you are able to connect
nc 182.156.238.158 7182
or
telnet 182.156.238.158 7182
Thanks,
Salim