How does GoToWebinar work with firewalls?
When GoToWebinar software is activated on a computer, it initiates one or more outbound, SSL-protected TCP connections with the GoToWebinar service, using ports that are already open in most firewalls and proxies (ports 8200, 443. and/or 80). Whichever connection responds first is used, and the others are dropped. It thus provides a high degree of compatibility with your existing network security.