The proxy server is refusing connections
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Disable Proxy Settings
I suggest you to follow the below steps to disable Proxy on Windows 10:
Click on Start, select Settings and navigate to Network & Internet > Proxy.
1. Toggle the option Automatically detect settings to ON.
2. Toggle the option Use a proxy server to OFF.
I suggest you to follow the below steps to disable Proxy on Windows 7 & Windows 8:
“Control Panel” > “Internet Options” > “LAN Settings” >Uncheck “Use proxy server for your LAN”