What ports in whatsapp need to be open in order for the app to function properly? In addition what urls need to be white-listed as well?
I found this for the ports. https://www.quora.com/What-is-the-port-number-for-whatsapp
As for URLs I didn't find anything right away, but I would suggest doing a packet capture to see what it is attempting to talk to.
This was helpful and resolved the issues I was having with whatsapp on our network.
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