While accessing below repo getting error

$ helm repo add pega https://pegasystems.github.io/pega-helm-charts Error: looks like "https://pegasystems.github.io/pega-helm-charts" is not a valid chart repository or cannot be reached: Get "https://pegasystems.github.io/pega-helm-charts/index.yaml": dial tcp Proprietary information hidden:443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.