Broken cluster

I am trying to build new cluster using kubeadm and Hardway as well. Most of the times I experience below error after installing all cluster components.

command: kubectl cluster-info
result: the connection to the server :6443 was refused - did you specify the right host or port?

Is there any order that i need to follow to debug this issue or randomly verify all the components. I have never been succeed in resolving this issue. Can you please assist me on this.