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New Contributor

Received unexpected DISCOVERY REQ, session tear down

My Forticloud managed 223C FortiAPs keep failing with this message, "Received unexpected DISCOVERY REQ, session tear down". Sometimes all of them in sequence, which is rather inconvenient. I have been removing things from the network to eliminate possible causes, but there is not much plugged in now. I was originally thinking it might be a chromecast. Fortinet Support has so far been unable to resolve the cause.


8 08-07 17:04 ap (ap-status) FP223C3X3 ap-fail Received unexpected DISCOVERY REQ, session tear down 9 08-07 17:03 ap (ap-status) FP223C3X2 ap-leave N/A 10 08-07 17:03 ap (ap-status) FP223C3X2 ap-fail Received unexpected DISCOVERY REQ, session tear down 11 08-07 17:03 ap (ap-status) FP223C3X1 ap-leave N/A 12 08-07 17:03 ap (ap-status) FP223C3X1 ap-fail Received unexpected DISCOVERY REQ, session tear down


Has anyone seen this before? Should an unexpected discovery request to cause the AP to fail? What might the cause be?

New Contributor

I'm seeing the same thing on mine.

Did you ever find out a solution?


No. I removed all of the old Chromecast devices from the network and only drops once per day, usually at 1AM. 

I was thinking it was related to this:



It started happening again. I upgraded firmware to 6.0, but it didn't help.


Has anyone find a solution for this?

I am managing FAP 321C through FortiCloud and all my APs fail and drop all connections

New Contributor

Were you able to resolve this?

New Contributor

My fix ended up being to increase the packet size and time limit on the firewall for the rule I had programmed.  


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