Active Directory and identity management: the backbone of business IT
Active Directory is the invisible foundation behind logins, permissions and the security of an entire company. When it's healthy, nobody knows it's there. When neglected, it becomes the biggest hole in your security.
Contents
What Active Directory solves
Active Directory is a central directory managing users, computers and their permissions. Instead of handling passwords and access on each device separately, you manage them from one place. Sign-in, access to shared folders, policies on computers — all of it leans on it.
Structure: organizational units and groups
A clear structure is a foundation that's hard to fix later. Two principles that last for years:
- Arrange organizational units (OUs) around how you manage policy — usually by department or location, not on a whim.
- Assign permissions through groups, never to individual users. A new hire just joins the right group and inherits exactly what they should have.
A proven model: user → role group → access group → resource. It sounds complex, but it's exactly what keeps permissions clear after years and dozens of changes.
Group Policy (GPO)
Group Policy lets you set the behaviour of hundreds of computers at once — from security rules through drive mapping to disabling risky features. Recommendations:
- Fewer, well-considered policies beat a pile of overlapping ones.
- Name every policy clearly so its purpose is obvious from the name.
- Test changes on a small group before releasing them company-wide.
Security and accounts
Active Directory is a prime target — whoever controls AD controls the company. The minimum that shouldn't be missing:
- Separate admin accounts — never administer with the account you read email on.
- A strong password policy and multi-factor authentication where possible.
- Regular review of membership in sensitive groups (Domain Admins and friends).
- Disable former employees' accounts immediately, don't delete them in a hurry.
The most common hole isn't a weak password, but a forgotten high-privilege account nobody has used for years and nobody thinks about.
Maintenance and hygiene
AD clutters over time — dead accounts, empty groups and computers that no longer exist pile up. Regularly (at least once a year) clean house: disable unused accounts, remove empty groups and check the structure still matches company reality. Tidy AD is also secure AD.
Need AD designed or cleaned up?
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