Check if you don't have a VPN or something like this messing with your connection. Also, check Jenkins DNS configurations (try to start it with "--dns 220.127.116.11".
Don't give up yet. Our experts can help. Paste your full stack trace to get a solution.
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)[?:1.8.0_101]
at java.net.PlainSocketImpl.connect(Unknown Source)[?:1.8.0_101]
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