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localhost refused to connect.

Try:

ERR_CONNECTION_REFUSED
Check your Internet connection
Check any cables and reboot any routers, modems, or other network devices you may be using.
Allow Chromium to access the network in your firewall or antivirus settings.
If it is already listed as a program allowed to access the network, try removing it from the list and adding it again.
If you use a proxy server…
Go to the Chromium menu > Settings > Show advanced settings… > Change proxy settings… > LAN Settings and deselect the "Use a proxy server for your LAN" checkbox.
localhost refused to connect.