I am running into this issue today, despite that I am able to add other helm repositories and get an update, I cannot add jupyterhub:
sudo helm repo add jupyterhub https://hub.jupyter.org/helm-chart/
Error: looks like "https://hub.jupyter.org/helm-chart/" is not a valid chart repository or cannot be reached: Get "https://hub.jupyter.org/helm-chart/index.yaml": dial tcp 172.64.80.1:443: connect: connection timed out
My helm version is version.BuildInfo{Version:"v3.7.1", GitCommit:"1d11fcb5d3f3bf00dbe6fe31b8412839a96b3dc4", GitTreeState:"clean", GoVersion:"go1.16.9"}
Any ideas why am I running into this particularly for JupyterHub?