@sweber I am having the same issue on 2.7.0-RELEASE. I have also imported the signing certs and tried the "Add this Certificate Authority to the Operating System Trust Store" on and off. The diagnostics options are too vague and not detailed enough. I performed a packet capture while testing with the authentication diagnostics and while the actual error is the "unknown CA" packet message, the pfSense authentication diagnostics logs just says "/diag_authentication.php: ERROR! Could not bind to LDAP server LDAP. Please check the bind credentials.". The logs also say "/diag_authentication.php: LDAP Debug: LDAP connection error flag: false" despite me enabling the "Set debug flag" in the Diagnostics / Authentication test page.
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