Err_proxy_connection_failed appears using the browser as shown in the figure below: 
Solution:
1. Enter setting -& GT; Click Show Advanced Settings:
2. Click to change the proxy server Settings:
3. Display Internet properties and click LAN Settings
4. Click the proxy server for LAN (√) and you’re done
Solution:
1. Enter setting -& GT; Click Show Advanced Settings:
2. Click to change the proxy server Settings:
3. Display Internet properties and click LAN Settings
4. Click the proxy server for LAN (√) and you’re done
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