At WiFi-U, we love showing students how to take control of their networks. One of the powerful features in the UniFi ecosystem is the ability to block unwanted applications with just a few clicks. Whether it’s TikTok, Snapchat, or any other bandwidth-hogging app, UniFi lets you shut it down quickly and cleanly.
Wait… What Is STUN, and Why Should I Care?
Imagine this, while scanning app traffic, STUN is showing up as one of your top bandwidth users. That might seem strange—especially on a quiet Wi-Fi network—but don’t panic. STUN isn’t doing anything malicious, and more importantly:
You absolutely should not block STUN.
STUN stands for Session Traversal Utilities for NAT, and it’s a vital part of how UniFi devices communicate with cloud services, especially when you’re running a self-hosted UniFi Network Application (e.g., on a Linux server).
What Happens If You Block STUN?
If you block STUN traffic (usually using port 3478), your Access Points and Switches may not be able to reach the UniFi cloud infrastructure. That means:
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❌ Your devices might not show up in Site Manager
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❌ You may lose remote management functionality
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❌ Troubleshooting will become much harder than it needs to be
In other words, blocking STUN can break your network visibility, which defeats the purpose of using UniFi’s management tools in the first place.
So next time you’re feeling like a network superhero and ready to kill off rogue apps—leave STUN alone. It’s one of the good guys. 👊
Want more hands-on training like this?
Check out our upcoming Ubiquiti courses and level up your network mastery: https://wifi-u.com/shop/
Author: Eric Weber
