Create a group policy when all prerequisite meet then only PC able to join the domain

Creating a Group Policy that enforces prerequisites before a PC can join the domain requires a combination of Group Policy Objects (GPOs) and conditional logic enforced by scripts, security policies, or network access control (NAC). Unfortunately, GPOs themselves don’t control whether a system can join the domain — that happens before Group Policies are applied.

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🔐 Recommended Approach: Enforce via Pre-Join Checks and Network-Level Controls

✅ Step 1: Define Prerequisites

Some common prerequisites:

• Specific OS version (e.g., Windows 10/11 Pro or Enterprise)
• Certain software installed (e.g., antivirus)
• Required security settings (e.g., BitLocker enabled)
• MAC address in allowed list (for corporate devices)
• TPM or Secure Boot enabled

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🔒 Step 2: Control Domain Join Using One of These Methods

Option A: Network Access Control (NAC) / DHCP Filtering

Only allow devices meeting policy to access the network where domain controllers reside.

• Use NAC (Cisco ISE, Aruba ClearPass, Microsoft NPS + 802.1X) to enforce:
  • OS compliance
  • Endpoint health
  • Device registration (based on MAC, certificate, etc.)
• Filter by MAC address or issue 802.1X certificates to approved systems only

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Option B: Pre-Staging Computers in Active Directory

• In Active Directory Users and Computers (ADUC):
  • Pre-create the computer account in a specific OU
  • Set permissions so only approved joiners can use it
• Combine with GPO enforced for that OU

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Option C: PowerShell Script Validation During Imaging or Deployment

Use a PowerShell script during device imaging or deployment (via MDT/SCCM/Intune/Autopilot) to check for requirements and only join the domain if they are met.

powershell# Sample PowerShell check
if ((Get-WmiObject -Class Win32_OperatingSystem).Caption -match "Windows 11") {
    if (Get-BitLockerVolume | Where-Object {$_.ProtectionStatus -eq 1}) {
        Add-Computer -DomainName "corp.domain.com" -Credential (Get-Credential) -Restart
    } else {
        Write-Host "BitLocker not enabled. Aborting domain join."
    }
} else {
    Write-Host "Unsupported OS version. Aborting domain join."
}

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🛡️ Step 3: Group Policy to Enforce Post-Join Compliance

After the system joins the domain, use GPOs to:

• Enforce BitLocker encryption
• Enforce antivirus install and real-time protection
• Restrict access until device meets posture requirements
• Trigger remediation scripts

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✅ Bonus: Combine With Intune Conditional Access (Hybrid-Join)

If using Hybrid Azure AD Join, leverage Intune + Conditional Access policies to:

• Block access to resources until compliance policies are met
• Automatically quarantine non-compliant devices