Thank you very much for lead me to this guide.
But i am not sure to have an fqdn for my AD provider which can be resolved via an external dns.
After read this guide i unterstand my certificate error as (please correct me),
that a “untrusted” cert on my AD provider ist the reason for my problems with connecting external clients or apps?
Maybe this is an “Newbee” question, but can i manual “trust” this “untrusted” AD certificate on the client machines (for Example an FreePBX)?