Solution:
ERR_TUNNEL_CONNECTION_FAILED, may occur when Chrome is unable to render the proxy response for some sites.
https://www.drivereasy.com/knowledge/err-tunnel-connection-failed-error-chrome-solved/
Zuora support has no idea about a proxy server. Could you please try another ISP. Or when the user experienced this issue again, could you please let the user run the curl with that problem resource URL?
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