I encountered this issue at work, turns out my internet connection was fine, but our internal networks were down. Including the VPN. It's worth nonting that we use Azure DevOps, but I don't have admin access to any of it, so I wasn't able to try the accepted answer. So, my solution was to file a network support ticket with IT so they're aware our network is down, and go home early once I ran out of things to do that didn't require the secure access to our network.