If this method does not fix the issue, follow the other solution below. A third-party firewall solution can cause an impediment when playing a game because most firewall solutions block Steam.

If there are network or connection issues, troubleshoot the Network & Internet problems and fix them up ... It may occur if your firewall is prohibiting the outgoing Steam connection.

Here's how to test and fix it. The macOS firewall in System Settings allows ... a Mac restart fixes the problem after updating. Being based on BSD, macOS uses a packet-based network filter known ...