I was troubleshooting the wireless network for a remote office because lot of users were complaining the WiFi is unstable and their devices got randomly disconnected. I checked the log and found out some APs are disconnected from the controller due to “Control message maximal retransmission limit reached”. And I came cross this document from Fortinet: https://kb.fortinet.com/kb/documentLink.do?externalID=FD40970 These messages imply that the keep alive packets ‘ECHO REQ (FGT)’ and ‘ECHO RESPONSE (FAP))’ were not successful or complete....