Some of you may have noticed that a Fortigate – configured to use the FortiGuard DNS Servers – is not resolving some DNS names anymore. Consequences can be that FQDN address objects can not be resolved or a configured mail server can not be used anymore.
Since a while, the most recent macOS versions the system do report the use of “legacy system extensions” which is often triggered by modules or plugins of low-level software like VPN Clients, AV software etc.
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