Rancher HA cluster

I am trying to set Rancher HA cluster with nginx load balancer in front of three nodes following the official documentation https://rancher.com/docs/rancher/v2.x/en/installation/ha/kubernetes-rke

Everything works fine till I run rancher helm charts. Everytime I get the following issue.

2019/07/02 19:43:53 [ERROR] Failed to connect to peer wss:// [local ID=]: dial tcp connect: connection timed out
Can anyone guide me in this issue?