Can’t connect to the internet? Check for a firewall or VPN failure

Macworld
People write in with mysteries all the time. One is why their Mac (and sometimes other devices) will seemingly connect to a Wi-Fi network just fine but not be able to access the internet via that connection. They know the password and network are both correct: they have other devices, like an iPhone, connected without a problem.The culprit is usually a firewall or VPN. Most people no longer use firewall software, even though macOS continues to offer it as an available feature in System