Exact model-family answer directory

Ubiquiti UniFi Cloud Gateway Ultra troubleshooting

Choose the symptom actually shown by UCG-Ultra. UniFi network; Network application version, gateway ownership, VLANs, PoE and adoption state are part of every diagnosis. Error codes remain separate records because the same characters can mean different things on another platform.

no internetWi-Fi dropsslow Wi-Fidead zonesdevice won't connectsetup

Reviewed records

11 exact answers

Not sure where the fault is?

Ubiquiti · DNS

Ubiquiti UniFi Cloud Gateway Ultra cannot open websites because DNS fails

For the Ubiquiti UniFi Cloud Gateway Ultra, resolver, filter, VPN and cache should be separated from a site or provider outage.

Open record Ubiquiti · 100 Mbps

Ubiquiti UniFi Cloud Gateway Ultra Ethernet link is limited to 100 Mbps or disconnects

For the Ubiquiti UniFi Cloud Gateway Ultra, every cable pair, wall jack, switch and port must negotiate the intended speed.

Open record Ubiquiti · firmware

Ubiquiti UniFi Cloud Gateway Ultra firmware update will not install

For the Ubiquiti UniFi Cloud Gateway Ultra, exact model/hardware revision, stable power, storage and signed firmware are required.

Open record Ubiquiti · no internet

Ubiquiti UniFi Cloud Gateway Ultra has Wi-Fi but no internet

For the Ubiquiti UniFi Cloud Gateway Ultra, provider modem/ONT, router WAN address, DNS and one client should be separated.

Open record Ubiquiti · slow Wi-Fi

Ubiquiti UniFi Cloud Gateway Ultra internet or Wi-Fi is slow

For the Ubiquiti UniFi Cloud Gateway Ultra, provider rate, wired router throughput, radio link and one service should be measured separately.

Open record Ubiquiti · parental controls

Ubiquiti UniFi Cloud Gateway Ultra parental controls or schedules are not working

For the Ubiquiti UniFi Cloud Gateway Ultra, target identity, randomized MAC, time zone, DNS/VPN bypass and overlapping profiles should be separated.

Open record Ubiquiti · port forwarding

Ubiquiti UniFi Cloud Gateway Ultra port forwarding is not working

For the Ubiquiti UniFi Cloud Gateway Ultra, local service, firewall, reserved IP, double NAT, CGNAT and provider blocks should be proved in order.

Open record Ubiquiti · restarts

Ubiquiti UniFi Cloud Gateway Ultra restarts, freezes or overheats

For the Ubiquiti UniFi Cloud Gateway Ultra, power supply, ventilation, load, firmware and hardware should be separated.

Open record Ubiquiti · double NAT

Ubiquiti UniFi Cloud Gateway Ultra shows double NAT or strict NAT

For the Ubiquiti UniFi Cloud Gateway Ultra, provider gateway/router mode, downstream router, CGNAT and local service state are different boundaries.

Open record Ubiquiti · VPN

Ubiquiti UniFi Cloud Gateway Ultra VPN client or server will not connect

For the Ubiquiti UniFi Cloud Gateway Ultra, provider/server, credentials, protocol, DNS, MTU, policy route and double NAT should be isolated.

Open record Ubiquiti · setup

Ubiquiti UniFi Cloud Gateway Ultra will not complete setup

For the Ubiquiti UniFi Cloud Gateway Ultra, modem/ONT provisioning, WAN type, app/account and cabling should be proved before resets.

Open record

Confirm the model first

Which units this covers, and how to tell yours is one of them

Every answer below is scoped to these model identifiers. A neighbouring model in the same line can use a different part, a different reset sequence or a different radio, so matching the identifier before following a procedure is the step that decides whether the rest of the page applies to you.

Model numbers and patterns: UCG-Ultra
What that covers: UniFi network; Network application version, gateway ownership, VLANs, PoE and adoption state are part of every diagnosis.

Published specification

What is true of this model and changes how you fix it

These are the properties that decide which procedure applies. Each is read from the manufacturer’s own published figures for this model, not carried over from a sibling that shares its retail name.

Type — compact GATEWAY/router, NO Wi-Fi: The UCG-Ultra is a small UniFi gateway (router, firewall, UniFi Network controller) with NO built-in Wi-Fi radio — it does not broadcast wireless. Wi-Fi symptoms do not apply; add separate UniFi APs. It is the compact, affordable way into the UniFi ecosystem.
Needs separate access points: 'No Wi-Fi' is expected — the Wi-Fi comes from UniFi APs connected to it (via a PoE switch/injector). Troubleshoot Wi-Fi at the APs.
UniFi controller/app: Runs the UniFi Network application on-device (managed web/app). Advanced compared with consumer routers.

Where these figures were read. ui.com UniFi Cloud Gateway Ultra (compact gateway/router, NO built-in Wi-Fi), read 2026-09-01

Manufacturer support for this product line. Ubiquiti Help Center — UniFi help. Official UniFi gateway, switching, Wi-Fi and controller documentation.

Exact questions

Questions that only have an answer for the Ubiquiti UniFi Cloud Gateway Ultra

Each answer below uses this model’s own published figures. The same question asked about a different model in the line has a different answer, which is why it is answered here rather than on a general page.

I set up a UniFi Cloud Gateway Ultra but have no Wi-Fi.+

That is because the Cloud Gateway Ultra has no built-in Wi-Fi radio — it is a compact gateway/router, not a wireless router. You need to add UniFi access points (such as a U6 Pro or U7 Pro), connect them (they need PoE, from a PoE switch or injector), and adopt them in the UniFi Network application running on the gateway. Once an AP is adopted and online, it broadcasts your Wi-Fi. The gateway itself only routes.

Structured depth, not empty permutations

Every published record carries a direct answer, scope, ordered fixes, risk notes and sources.

Device and manufacturer hubs share a consistent record system, but each answer carries the relevant controls, fault boundaries, consequences and official support entry point for that platform.

See the publication gate