Which Cisco WLC debug command allows you to determine if the certificate process is failing in the CAPWAP messages?

The `debug pm pki enable` command on a Cisco WLC enables debugging for the Policy Manager (PM) and Public Key Infrastructure (PKI) components. This is the most targeted command for troubleshooting certificate validation and related cryptographic failures that occur during the establishment of a secure CAPWAP tunnel.

`debug cert events enable` is not a standard or recognized debug command for certificate-related issues on Cisco Wireless LAN Controllers.

`debug capwap events enable` provides general CAPWAP event logs, but it may not offer the specific, granular details about certificate processing failures that `debug pm pki enable` does.

`debug capwap packet enable` displays raw CAPWAP packets, which is very verbose and requires deep protocol knowledge to extract certificate-specific error information.

`debug capwap errors enable` provides a summary of CAPWAP errors but may not pinpoint the exact cause of a certificate failure within the process, making `debug pm pki enable` a more precise tool.