Hi Cindy,
I wasn’t exactly sure about firewalls so I asked our Zoom rep. Here is what she wrote back to me. Obviously, she is promoting their product but here is the answer I got if you would like to read it.
In a nutshell, when Zoom was in the very beginning stages of development, Eric (our CEO) told his engineers to study the Internet and basic Internet protocols. As the VP of Engineering from WebEx (and also hand-picking his "dream team" of engineers to work alongside with at Zoom), he knew many of the firewall issue users experienced. Basically, he knew what not to do wrong, and what to do right. Because of this, Zoom created a completely different (and proprietary) way of connecting into a live cloud/online meeting. Zoom users the same protocol that the Internet using to first connect. If an individual has access to the Internet (via any browser), they can connect to Zoom. Once in a session, then the users are completely secure/private and running through our architecture and Zoom's native servers. Because Zoom developed this different way of joining a session, it has alleviated 99.99999% of the issues other users experience joining an online/cloud based meeting.
Probably way too much information, but the story tells how we think differently and are different in all that we do. To answer the question: no, you should not experience an issue with a firewall block with Zoom. We currently have hundreds of local and state agencies, the US Gov't., the federal government, hospitals and 2,500+ education institutions as customers today - and none have ever experienced an issue.
Katerina Newton
System Administrator III
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