please refer to https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/windows_integration_guide/trust-during#trust-req-ports


On Fri, Oct 15, 2021 at 2:14 PM iulian roman via FreeIPA-users <freeipa-users@lists.fedorahosted.org> wrote:
Hello everybody,

I have an  Idm setup configured with AD trust.  I would like to know if the systems in  DMZ need to have firewall ports opened only for IPA servers or they need to access AD domain controllers as well ? Apparently, only with the rules for the IPA servers the authentication does not work.

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