Why access points that do not allow WiFi connection to the phone and themselves?

Zyxel_JoyLee

This behavior usually happens because the two access points are interfering with each other, incorrectly configured, or creating a network loop/conflict.
The most common reasons are:

1. Same Channel Interference

• Two APs nearby are using the same or overlapping WiFi channel.
• When one AP powers on, it creates heavy RF interference and clients cannot connect properly.
• Very common on 2.4GHz.

2. Duplicate IP Address

• Both APs may have the same management IP address.
• When one AP turns on, the other becomes unreachable or unstable.

3. SSID Security Mismatch
If APs broadcast the same SSID but: different passwords

• different security modes (WPA2/WPA3)
• different VLANs

then phones may fail roaming and disconnect repeatedly.

4. Power / PoE Issue
Sometimes enabling one AP increases power consumption:

• Switch PoE budget becomes insufficient
• Other AP shuts down or behaves abnormally

5. Loop in Ethernet Network
If APs are connected incorrectly:

• Ethernet loop may occur
• Entire network becomes unstable