Exact model-family answer directory

Ubiquiti UniFi gateways troubleshooting

Ubiquiti UniFi gateways (UDM-Pro, with the Dream Machine SE (UDM-SE) and Cloud Gateway Ultra (UCG-Ultra) in the model notes): ports (from Ubiquiti's tech specs and B&H); hardware; form, and a fix for each symptom below.

Ports (from Ubiquiti's tech specs and B&H)
Eight 1 GbE RJ45 LAN ports, one 1 GbE RJ45 WAN port, one 1/10 GbE SFP+ LAN port and one 1/10 GbE SFP+ WAN port.

No internetWi-Fi dropsSlow Wi-FiDead zonesDevice won't connectSetup

Part of Ubiquiti network model troubleshooting guide

Reviewed records

11 exact answers

Diagnose the exact device problem

Ubiquiti · DNS

Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra) cannot open websites because DNS fails

Open record Ubiquiti · 100 Mbps

Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra) Ethernet link is limited to 100 Mbps or disconnects

Open record Ubiquiti · firmware

Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra) firmware update will not install

Open record Ubiquiti · no internet

Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra) has Wi-Fi but no internet

Open record Ubiquiti · slow Wi-Fi

Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra) internet or Wi-Fi is slow

Open record Ubiquiti · parental controls

Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra) parental controls or schedules are not working

Open record Ubiquiti · port forwarding

Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra) port forwarding is not working

Open record Ubiquiti · restarts

Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra) restarts, freezes or overheats

Open record Ubiquiti · double NAT

Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra) shows double NAT or strict NAT

Open record Ubiquiti · VPN

Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra) VPN client or server will not connect

Open record Ubiquiti · setup

Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra) will not complete setup

Open record

Confirm the model first

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

Model numbers and patterns: UDM-Pro, with the Dream Machine SE (UDM-SE) and Cloud Gateway Ultra (UCG-Ultra) in the model notes

Published specification

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

Official specifications
Quad-core ARM Cortex-A57 @ 1.7GHz, 4GB RAM, 16GB onboard storage plus one 3.5" NVR HDD bay. One GbE RJ45 port with 9 sub-ports (1G/100M/10M), two 10G SFP+ ports, up to 8 WAN ports. 3.5Gbps IDS/IPS throughput, manages 100+ UniFi devices / 1,000+ users. Rack-mount 1U, 442.4 x 43.7 x 285.6mm, 3.9kg, 33W max consumption.
Type — rack GATEWAY/router, NO Wi-Fi
The UDM Pro is a rack-mount UniFi gateway (router, firewall, controller, NVR) with NO built-in Wi-Fi radio — it does NOT broadcast a wireless network. So Wi-Fi symptoms (dead zones, wifi-drops) do not apply to it; you add separate UniFi access points for Wi-Fi. It handles routing, VLANs and the UniFi Network application.
Needs separate access points
Because it has no radio, 'no Wi-Fi' on a UDM Pro is expected — the Wi-Fi comes from UniFi APs you connect to it (often via a PoE switch). Troubleshoot Wi-Fi at the APs, not the gateway.
UniFi controller/app
Managed through the UniFi Network application (web/app), which is more advanced than consumer routers — VLANs, adoption, firmware and site settings live there.
Hardware
A quad-core ARM Cortex-A57 at 1.7 GHz, 4 GB DDR4, 16 GB eMMC, IDS/IPS throughput of 3.5 Gbps, a 3.5-inch drive bay so UniFi Protect video can be stored on the unit, and 33 W maximum power. The 8-port switch is non-blocking at 16 Gbps.
Form
1U rack unit, 442.4 x 43.7 x 285.6 mm.

Where these figures were read. techspecs.ui.com/unifi/cloud-gateways/udm-pro (UniFi Dream Machine Pro - Tech Specs)

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

Also read for this model. Ubiquiti — UniFi Dream Machine Pro tech specs; B&H — Ubiquiti UniFi Dream Machine Pro.

Exact questions

Questions that only have an answer for the Ubiquiti UniFi gateways (Dream Machine Pro, Dream Machine SE and Cloud Gateway Ultra)

My UniFi Dream Machine Pro isn't broadcasting Wi-Fi.+

That is expected — the UDM Pro has no built-in Wi-Fi radio, so it never broadcasts a wireless network on its own. It is a rack gateway/router; Wi-Fi comes from separate UniFi access points (like a U6/U7 Pro) that you connect, usually through a PoE switch, and adopt in the UniFi Network application. So to add or fix Wi-Fi, work with the access points; the Dream Machine Pro handles routing, not the radio.