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New AP cant be detected by the controller

New AP cant be detected by the controller

New Contributor
Today we tried to configure new APs for our remote sites. But when we connect new APs in the working network the controller cant detect the APs. Its more tham 30mins now and the controller hasn't detected it yet, i already added it up to the AP menu but it cant still be detected. This only happened today. And we are behind of schedule because of this. I hope you guys could help us.



Extreme Employee

you can configure the COntoller IP staticaly on the AP.

ssh to the AP


#cset dhcpc disable

#cset ipaddr x.x.x.x ( IP for the AP itself)

#cset ipmask x.x.x.x

If the AP get his IP from a local DHCP Server you don't need do the commands above

and need only do the next command where you configure the COntroller Ip in the AP.

#set authipaddrs 1 x.x.x.x (x IP of the Controller)




Then the AP should known the COntroller IP

New Contributor III
When I deploy for local and remote sites, I create an "A" record of Controller with the IP of the Wireless Controller. You also have the option of a DHCP option 43.

This will point your AP's to the controller no matter what vlan/subnet they are on as long as they can resolve the name. Also, when deploying to a remote site, it is good to start your MTU Size at 1400. Anything higher than that, the AP may associate but the radios will not turn on due to packet fragmentation.

Please let us know if this does not work for you and if there is anything else we can assist you with 🙂

New Contributor III
Hi Carlo,

what APs you are trying to connect to your controller? What firmware do you use on the controller site, and how does the assignment works?

Extreme Employee

did you try to set the AP to factory default.
Additionally remove it from the Controller WebGui as well.

Maybe the AP tries a FW upgrade in the backgound.
So enable controlled upgrade and look if this helps.

It could be also a MTU issue?!

Try the first 2 and then we can look further.

Umut Aydin