I’ve been digging a bit and I found that UE itself uses port 11111 during operation, I’m still trying to find official documentation instead of sniffing the ports out manually. I’m trying to see if I can get a specific document to aid enterprise installations, but in the meantime we have a couple of resources below.
Protocol: UDP
Port: 0.0.0.0:11111
Foreign Address: *:*
PID: 39784
Then here’s a list that are associated with the Epic Games Launcher (but also fortnite).
https://www.epicgames.com/help/en-US/epic-games-store-c5719341124379/launcher-support-c5719357217435/how-to-unblock-ports-to-connect-to-the-epic-games-launcher-and-fortnite-a5720237410331
This post has a list of domains that should cover the installation/store side fine, even the UE CDNs are listed.
https://www.epicgames.com/help/en-US/technical-support-c5719357686683/general-support-c5719341627163/how-to-troubleshoot-connection-issues-a5720352654107