I got a following error message on chrome browser.
net::ERR_TUNNEL_CONNECTION_FAILED
Accessing through a proxy server to google GMAIL , but the proxy server denying access by category filtering. Your boss tells you "don't use web mail!!"
Proxy server is trying to redirect the session , but browser denyed redirect session when the session is under https session.
This is security issue on the https session.
In this case , you should check proxy block logs, you'll see some block logs.
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