Identify if you are behind a Firewall or Proxy

If you are trying to connect to a webinar from work, a school, government, or religious organization, you may run into a Firewall issue. There are steps you can take to identify if you are behind a Firewall.

If have a network Firewall enabled, you may see a black video screen or a "Connection Can't Be Established" warning or you may drop connection regularly (like every 10 seconds). 

Note: If webcast mode or new attendee experience is enabled, attendees should not be impacted. 

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. If you continue to experience issues, you may need to follow the rest of the rules below.

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 and can be any IP address, so you cannot allowlist an IP address range. 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 servers with * domain. 

Explicit Firewall rules for your IT department:

443/tcp ALLOW *
80/tcp ALLOW *
80/udp ALLOW *
53/udp ALLOW *
443/tcp (v6) ALLOW * (v6)
80/tcp (v6) ALLOW * (v6)
53/udp (v6) ALLOW * (v6)

53/udp ALLOW OUT *
80/tcp ALLOW OUT *
443/tcp ALLOW OUT *
443/udp ALLOW OUT *
53/udp (v6) ALLOW OUT * (v6)
80/tcp (v6) ALLOW OUT * (v6)
443/tcp (v6) ALLOW OUT *
443/udp (v6) ALLOW OUT * (v6)


If this does not work, have your IT department email

**Troubleshoot tips:

  • If you are behind an Application Firewall BigMarker will not be able to penetrate it unless it's disabled. 
  • We recommend disabling any anti-virus programs (ex: Kaspersky, Norton, McAfee, AVG, Windows Security Essentials, etc. Be sure to also disable Windows Firewall). Programs like these consume CPU resources, and may block ports needed for a successful webinar experience.