In the world of managed networking, we expect new hardware to bring better performance and reliability. However, a recent firmware issue that appears to affect the newest generation of UniFi Wireless Access Points (WAPs) has been causing headaches for users and IT teams alike.
At Macktez, we’ve been tracking a suspected problem impacting the latest U7 series WAPs (specifically those utilizing the new Qualcomm chips) deployed over the last three to six months.
The symptom: 169 IP address
The core of the issue is a failure to reliably obtain an IP address. Users might experience the following:
- Authentication without connection: Your device accepts the WiFi password and authenticates to the network, but then hangs while trying to assign an address.
- Self-assigned IPs: Eventually, the device gives up and assigns itself an IP address starting with “169,” which provides no internet or network access.
- UniFi Logs: Administrators will see these events flagged as “DHCP Timeouts” within the UniFi controller logs.
DHCP is the protocol used to automatically assign local IP addresses to devices, allowing them to communicate on a network. The bug appears to occur during the four-part DHCP handshake where the access point intermittently drops the third packet (the DHCP request) before it can reach the server. An unsuccessful DHCP assignment leaves the local device with a self-assigned “169” address that does not facilitate any network communication.
The culprit: firmware version 8
Our investigation and reports from the broader community suggest a strong correlation with firmware updates:
- Version 8 impact: The issues appear once systems are updated to version 8 (including the current stable release, 8.4.43).
- Hardware correlation: High-end models like the U7 Pro XG and U7 Pro Max are primarily impacted. Older, sub-$200 WAPs running version 7 firmware seem to remain unaffected.
- Environment specifics: This bug primarily affects “mixed” environments where UniFi WAPs are paired with third-party DHCP servers or firewalls (like SonicWall firewalls). Networks using a full UniFi stack (e.g., a Dream Machine Pro) appear to be less commonly affected, according to community reports.
Current remedies and next steps
Because the issue is intermittent, it can be difficult to pin down, often appearing when a user first connects for the day or roams between different WAPs in an office.
What you can do:
- Firmware rollback: If your hardware supports it, rolling back to a late version 7 firmware has resolved the issue for some sites.
- Early access (EA) beta: Ubiquiti has released beta firmware that specifically claims to address “dropped DHCP packets.” While early tests are promising, we are still monitoring this version for long-term stability.
- Hardware swaps: We are evaluating replacing impacted U7 models with older generation units that can run stable version 7 firmware.
How Macktez can help
If you have recently installed new UniFi wireless hardware and your team is struggling with intermittent failures to connect or drops, let us know. We can help determine if your specific models are impacted and guide you through a safe firmware rollback or an Early Access update to restore your connectivity.
Cybersecurity is a continuous practice, and keeping your infrastructure firmware stable is a vital part of that work. Report any unusual network behavior to your manager or IT support team promptly.