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We have one Unifi AP in a classroom that services iPads, last week it stopped working. Whenever it is power cycled, the network SSID from it is visible for about 1 minute then disappears, the green status light on in then flashes every now and then.

The controller seem to of crashed after upgrading. So we deleted it and re-installed the controller software, setup a new network, I held in the reset button to scan for the AP and we found it.

When we try to adopt the AP the adoption fails. Could this be the AP is on 192.168.1.20 and our IP scheme is 172.16.4.x?

Do I need to manually adjust the IP address, as I thought if the AP is set to automatic DHCP then it would automatically pick up our IP scheme?

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Hmmmm, interesting issue. I can tell you the green light flashing is not right. Generally it is solid green.

I know we had one of our AP’s get weird, and did the reset thing successfully and our network is not 192.168.x.x.

What version of the controller are you using?

Also, I moved this over to the wireless forum.

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Has the PoE been moved/knocked?

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Thanks for moving to the correct forum, am using on UniFi Controller 2.3.9 on Windows, it used to be on our Mac server but thought I would try a different controller.

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So the AP is set to DHCP and it is picking up a 192.168.1.20 address?

That seems odd considering your DHCP is 172.16.4.x.

Is the server an address in the 172.16.4.x network?

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It used to have a POE adapter to work with our POE switches, I have now moved it back to it’s usual POE plug it comes with.

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I might be wrong on this, in the controller under the access point it has Network Settings and ‘Using DHCP’ is selected as opposed to ‘Static IP’ which I assume is correct.

The server is on 172.16.4.3.

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flashing green means the AP is disconnected and can’t access the gateway on the network.

What are the different LED state

UAP/UAP LR/UAP Outdoor:
Blinking Amber/Orange - initializing
Steady Amber/Orange - factory defaults
Steady Green - adopted
Steady green with occasional flashing (once every 3 or 4 seconds) - isolated (This means that AP cannot reach to the gateway. Starting from v2.3.x, uplink monitor can be disabled under “Settings” > “System” > uncheck “Uplink Connectivity Monitor”).

192.168.1.20 is the address it defaults to if it can’t get an address via DHCP. are you sure the AP is connected to your network correctly?

If you connect a laptop to the line the AP is using (with POE removed) does the line work?

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check out the Unifi Wiki it is full of good info

http://wiki.ubnt.com/UniFi_FAQ

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Bingo, the MAC address is being blocked from our DHCP server. Have just removed the block and it’s now it’s on solid green.

That’s wasted 2 hours of my day, will need to have a word with my colleague.

Thanks for all the help guys.

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glad you got it :slight_smile:

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Be aware that the Unifi’s are 24 volt, not the usual 48 volts that most POE switches put out. You pretty much have to use their POE injector.

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Sorry to resurrect an old thread but I am having this problem too - I understand that it probably is something on the network blocking the MAC address of the AP but how do I go about checking if its blocked / unblocking it?

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If the above thread doesnt’ help you then please open a new thread so we can assist you further. feel free to reference this one when you open the new one

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