Due to the expiration of Manufacturer Installed Certificates (MICs) in Wireless LAN Controllers (WLCs) and/or Access Points (APs), connections of these types might fail to establish: AP-to-WLC Control and Provisioning of Wireless Access Points (CAPWAP) connectionsWLC-to-WLC encrypted mobility connections (CAPWAP)WLC-to-Mobility Services Engine (MSE) or Connected Mobile Experience (CMX) Network Mobility Services Protocol (NMSP) connectionsWhen an AP attempts to establish a new connection, the AP fails to join. When you configure mobility tunnels between controllers, they fail to establish a connection.The likelihood that this issue will be encountered is 100% for wireless APs and WLCs that are more than 10 years old and were manufactured prior to 2017.In order to help determine the potential future impact, a list of APs and WLCsand their release dates can be found in the Lightweight AP - Fail to create CAPWAP/LWAPP connection due to certificate expiration Cisco Community article.

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