In which scenarios do I need IPA clients to be able to connect to Windows AD DCs directly (Kerberos 44/464 TCP/UDP)?

I thought it was needed for passwordless logins because https://access.redhat.com/webassets/avalon/d/Red_Hat_Enterprise_Linux-8-Installing_Identity_Management-en-US/images/fc93488580ceb829bd9e8bf2379ea978/231_RHEL_troubleshooting_cross-forest_0422_firewall.png says Kerberos.

Jakubs blog post https://jhrozek.wordpress.com/2015/08/19/performance-tuning-sssd-for-large-ipa-ad-trust-deployments/ says "For password-based authentication requests, the IPA clients connect directly to the AD servers using Kerberos."

Will I lose the ability to log in password-based if these ports are blocked by the firewall?

Cheers,
Ronald
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