If you are trying to connect to a webinar from work, a school or religious organization, you may run into a Firewall issue. If have a network Firewall enabled, you may see a black video screen or a "Connection Can't Be Established" warning:
You'll need to save, or copy and paste the URL of your test results and forward them to BigMarker at firstname.lastname@example.org. However, if you see that you have a red "X" in your results for WebRTC connectivity, you most likely have a network firewall. This occurs most frequently in schools, government agencies, and large corporations.
What can you do?
If possible, please contact your IT department and have them open the necessary Ports (see below).
Minimum Requirement: Assumed by default is that TCP ports 80 and 443 are open. Some firewall rules only allow for TCP traffic over port 443, make sure that all traffic can pass over this port.
Best Experience: In addition to the minimum requirements being met, we recommend that UDP ports 1025 - 65535 be open.
More info: Our streaming server IP addresses change dynamically. If you are looking to add our domain to be allowed in your firewall, the easiest thing to do is to allow traffic from all bigmarker.com servers with *.bigmarker.com domain.
Router configuration: Your organization's router might have some preconfigured settings that could disrupt your webinar's audio. You may need to disable SIP ALG within your router. Here's how your IT person can disable SIP ALG. For more information click here.
Explicit Firewall rules for your IT department:
443/tcp ALLOW Anywhere
80/tcp ALLOW Anywhere
53/udp ALLOW Anywhere
443/tcp (v6) ALLOW Anywhere (v6)
80/tcp (v6) ALLOW Anywhere (v6)
53/udp (v6) ALLOW Anywhere (v6)
53/udp ALLOW OUT Anywhere
80/tcp ALLOW OUT Anywhere
443/tcp ALLOW OUT Anywhere
443/udp ALLOW OUT Anywhere
53/udp (v6) ALLOW OUT Anywhere (v6)
80/tcp (v6) ALLOW OUT Anywhere (v6)
443/tcp (v6) ALLOW OUT Anywhere (v6)
443/udp (v6) ALLOW OUT Anywhere (v6)