#AD & LDAP

[Active Directory DNS Records](https://blog.andreas-schreiner.de/2017/10/16/active-directory-dns-records/)  
[How to join Ubuntu to Active Directory](https://codymoler.github.io/tutorials/ubuntu-active-directory/)  
[Ports required for Active Directory and PKI](https://www.encryptionconsulting.com/ports-required-for-active-directory-and-pki/)  
[SSSD and Active Directory](https://ubuntu.com/server/docs/service-sssd-ad)