This is a duplicate of a known issue: https://issuetracker.unity3d.com/issues/crash-on-system-dot-net-dot-sockets-dot-socket-queueioselectorjob-when-using-a-vpn-and-opening-a-project-that-uses-visual-studio
As part of mono's initialization of its threadpool it establishes a socket connection to itself on localhost. Some firewalls (and VPNs) are very aggressive and block access to any socket API call by a process, even if it is not an outbound connection. Fixing this issue would require a large rewrite of mono's threadpool implementation which is too risky of a change at this time.