Slow Ubiquiti UniFi PRO AP – Troubleshooting and Fixing

I finally setup my Ubiquiti UniFi PRO AP, but also had to fix some slow speeds on it.

Slow Ubiquiti UniFi PRO – Introduction

When my MR18 license expired, I picked up a new AP AC PRO from Ubiquiti.

If you aren’t familiar, then you can check out the Quick Start Guide.

This should cleanup my homelab setup and give me a similar level of configuration.

That said, I ran into some speed issues when I first set this up, and I wanted to cover how I fixed them.

Unpacking and Connecting

First, I unpacked the box and saw what it came with.

Slow Ubiquiti UniFi PRO - Box

As you can see, I got the access point, a POE injector, the power cable, and a small mounting bracket.

Box contents

Back sides

It took me a little while to figure out where to plug everything in, but there is a small piece of rubber on the back that comes off to expose the ports.

Slow Ubiquiti UniFi PRO - Ports

Once I got everything connected, the access point turned on, and I got a cool-looking blue light.

Powered on

The POE injector was handy, and it also handled the ethernet from my router.

POE injector

Initial Configuration

After I had everything setup, I went to the download page and grabbed the, ‘UniFi Network Controller 5.12.22 for Windows’.

First, I went through the installation process, and made sure to disable optimization and backup.

Slow Ubiquiti UniFi PRO - Network setup

Next, the controller detected my access point, which was a good sign.

Devices setup

Finally, I finished the configuration, and updated my device’s firmware.

Overview and updates

Slow Ubiquiti UniFi PRO – Fixes

Unfortunately, when I got everything setup, I was only seeing speeds of about 225Mbps.

Slow Ubiquiti UniFi PRO - Initial slow speeds

With my 1Gbps connection, I was expecting speeds of at least 400Mbps, even with a device designed for multiple clients.

After looking around, I found a few threads with similar issues.

First, I verified that my 2.4GHz and 5GHz radios were set to the default settings.

Default radio settings

Next, I started an RF scan, to see if I could find any less populated channels.

RF scan

Since I wanted to swap to VHT 80 for throughput, it looked like Channel 122 would be my best bet.

Slow Ubiquiti UniFi PRO - RF scan results

With the RF results from my scan, I updated my channel and width settings.

New channel settings

Testing the Changes

With my channel changes in place, I ran some new diagnostics.

First, my Android was connecting at 866Mbps, which was a good sign.

Android transmit speed

When I reran my speedtest, I was able to get over 400Mbps. This isn’t the max theoretical speed, but far more acceptable once I run multiple devices.

Slow Ubiquiti UniFi PRO - Improved speed test

Slow Ubiquiti UniFi PRO – Conclusion

I’m looking forward to configuring my access point for more SSIDs, VLANs, and features.

In the meantime, this will still be an improvement of a generic wireless router and will give me more control than my AT&T device.

If you have any speed suggestions, then please let me know!

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Ray Doyle
Ray Doyle is an avid pentester/security enthusiast/beer connoisseur who has worked in IT for almost 16 years now. From building machines and the software on them, to breaking into them and tearing it all down; he's done it all. To show for it, he has obtained an OSCE, OSCP, eCPPT, GXPN, eWPT, eWPTX, SLAE, eMAPT, Security+, ICAgile CP, ITIL v3 Foundation, and even a sabermetrics certification!

He currently serves as a Senior Staff Adversarial Engineer for Avalara, and his previous position was a Principal Penetration Testing Consultant for Secureworks.

When he's not figuring out what cert to get next or side project to work on, he enjoys playing video games, traveling, and watching sports.

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