AP Not Joining Controller – %DTLS-3-HANDSHAKE_FAILURE
If you’re trying to connect older Access Points (APs) to a newer Wireless LAN Controller (WLC), you might stumble upon this frustrating issue: the AP simply refuses to join. Instead, the log fills up with errors like DTLS-5-PEER_DISCONNECT (Peer x.x.x.x has closed connection) and FATAL: Certificate unknown. This can feel like a bad networking horror … Read more