I'm currently training through Elasticsearch learning center but I'm having trouble at the Lesson 4's lab. I was required to update my cluster from v7.17.1 to v8.1.0, this part went fine, but after that, everytime I tried to open Kibana, I met the same error : connection refused by proxy.
I tried rebooting Kibana, the cluster and the virtual machines themselves but this didn't solve the issue and I'm not keen to go on blind counter-measures in case I would messed up the whole lab environment.
What am I missing here? How can I troubleshoot this without compromising my progress please?