UniFi U7 WiFi bug: DHCP timeouts and connectivity issues

We've been tracking a firmware bug in Ubiquiti's newest U7 wireless access points that stops devices from getting an IP address, leaving users authenticated to WiFi but with no network or internet access. Here is what we're seeing and what to do about it.

The problem appears to affect the latest U7 series access points (specifically those using the new Qualcomm chips) deployed over the last three to six months.

The symptom: a "169" IP address

The core of the issue is a failure to reliably obtain an IP address. Users may see:

• Authentication without connection: The device accepts the WiFi password and authenticates to the network, then hangs while trying to get an address.
• Self-assigned IPs: Eventually the device gives up and assigns itself an address starting with 169, which provides no internet or network access.
• DHCP Timeouts in the logs: Administrators will see these events flagged as "DHCP Timeouts" in the UniFi controller logs.

DHCP is the protocol that automatically assigns local IP addresses to devices so they can communicate on a network. The bug appears during the four-part DHCP handshake: the access point intermittently drops the third packet (the DHCP request) before it reaches the server. When the assignment fails, the device falls back to a self-assigned 169 address that can't communicate on the network.

The culprit: firmware version 8

Our investigation, along with reports from the broader community, points to a strong correlation with recent firmware updates:

• Version 8 impact: The problems 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 affected. Older, sub-$200 access points running version 7 firmware seem to remain fine.
• Environment specifics: The bug primarily affects mixed environments where UniFi access points are paired with third-party DHCP servers or firewalls (such as SonicWall firewalls). Networks running a full UniFi stack, like 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 hard to pin down. It often shows up when a user first connects for the day or roams between access points 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 at some sites.
• Early Access (EA) beta: Ubiquiti has released beta firmware that specifically claims to address dropped DHCP packets. Early tests are promising, but we are still monitoring this version for long-term stability.
• Hardware swaps: We are evaluating replacing affected U7 models with older units that can run stable version 7 firmware.

How Macktez can help

If you recently installed new UniFi wireless hardware and your team is dealing with intermittent connection failures or drops, let us know. We can help determine whether your specific models are affected and walk you through a safe firmware rollback or an Early Access update to restore connectivity.

Keeping infrastructure firmware stable is an ongoing part of good security practice. Report any unusual network behavior to your manager or IT support team promptly.