Replace Your Legacy VPN With An Identity-Centric ZTNA

Zero Trust Network Access (ZTNA) is revolutionizing secure remote access by shifting from traditional VPNs to identity-centric models. Microsoft Entra offers a robust solution to modernize your security infrastructure.

You Should Know:

1. Key ZTNA Concepts

ZTNA enforces strict access controls based on user identity, device health, and context—eliminating implicit trust.

2. Migrating from VPN to ZTNA

Step 1: Assess current VPN dependencies.

Step 2: Deploy Microsoft Entra Conditional Access policies.

Example: Enforce MFA for external access 
New-ConditionalAccessPolicy -Name "ZTNA-MFA-Enforcement" -Users "All" -Applications "All" -GrantControls "RequireMultiFactorAuthentication"

Step 3: Integrate Entra ID with endpoint management (Intune/SCCM).

Verify device compliance via Graph API 
curl -H "Authorization: Bearer $token" https://graph.microsoft.com/v1.0/deviceManagement/managedDevices?$filter=complianceState eq 'compliant'

3. Linux & Windows ZTNA Commands

Check Active VPN Connections (Windows):

Get-VpnConnection | Select Name, ServerAddress, ConnectionStatus

Audit Linux Network Access:

sudo netstat -tulnp | grep -E 'vpn|openconnect'

Block Legacy VPN Protocols:

sudo iptables -A INPUT -p tcp --dport 1723 -j DROP  PPTP blocking

4. Automating ZTNA Policies

Use Azure CLI to enforce Zero Trust rules:

az login 
az policy assignment create --name 'ztna-access-control' --display-name 'ZTNA Strict Access' --policy '<policy-definition-ID>'

What Undercode Say

Transitioning from VPNs to ZTNA reduces attack surfaces and improves scalability. Key steps include:
– Enforcing MFA via New-ConditionalAccessPolicy.
– Monitoring device compliance with Graph API.
– Blocking outdated protocols (e.g., PPTP/IPsec).
– Automating policy deployment via Azure CLI/PowerShell.