https://community.watchguard.com/watchguard-community/discussion/3528/authentication-failures-with-newer-watchguard-authentication-gateway-sso-eventlogmonitor-ad-pcs
Authentication failures with newer Watchguard Authentication Gateway (SSO eventlogmonitor + AD PCs)...
Some months ago we upgraded the Watchguard Authentication Gateway to 12.7.2 and then 12.10.
authenticationfailuresnewerwatchguardgateway