Introduction to Network Access Protection Network Access Protection (NAP) is a Windows Server technology that evaluates the health of client computers attempting to connect to the network and restricts access for machines that do not meet defined health requirements. NAP checks conditions such as whether Windows Firewall is enabled, antivirus signatures are up to date, […]
Introduction to RADIUS Proxy A RADIUS proxy receives authentication requests from RADIUS clients (VPN servers, wireless APs, switches) and forwards them to remote RADIUS servers based on configurable rules. Windows Server 2019 with the Network Policy Server (NPS) role can function as a RADIUS proxy in addition to—or instead of—acting as a full RADIUS server. […]
Introduction to 802.1X Network Access Control 802.1X is an IEEE standard for port-based network access control. It ensures that only authenticated and authorized devices can connect to a network—whether wired or wireless. In an enterprise environment, 802.1X prevents unauthorized devices (laptops, phones, IoT devices) from simply plugging into a network port or connecting to a […]
Introduction This tutorial covers How to Set Up SSH Two-Factor Authentication on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 15 system is up to date: […]
Introduction to RADIUS Authentication RADIUS (Remote Authentication Dial-In User Service) is a networking protocol that provides centralized authentication, authorization, and accounting (AAA) for network access. Windows Server 2019 implements RADIUS through the Network Policy Server (NPS) role. NPS acts as a RADIUS server that authenticates users trying to connect via VPN, wireless access points, 802.1X […]
Introduction This tutorial covers How to Configure SSH Key Authentication on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 15 system is up to date: zypper […]
Introduction to LDAP Security LDAP (Lightweight Directory Access Protocol) is the protocol that applications use to query and modify Active Directory. By default, Windows Server 2019 domain controllers accept LDAP connections on port 389 without requiring signing or channel binding, making them vulnerable to man-in-the-middle attacks where an attacker can intercept and relay LDAP authentication. […]
Introduction to Certificate Auto-Enrollment Manual certificate distribution in a large Active Directory environment is impractical and error-prone. Certificate auto-enrollment automates the process of requesting, issuing, and renewing certificates for users and computers based on Group Policy. When configured, domain members automatically receive certificates from your internal Certificate Authority (CA) without any user interaction. This is […]
Introduction to Active Directory Trust Relationships Active Directory trust relationships allow users in one domain or forest to access resources in another domain or forest. Trusts are directional—a trust between Domain A and Domain B means users in Domain A can authenticate to Domain B (or vice versa, depending on direction). Windows Server 2019 supports […]
Introduction to Read-Only Domain Controllers A Read-Only Domain Controller (RODC) is a domain controller that hosts a read-only copy of the Active Directory database. RODCs were designed specifically for branch office scenarios where physical security cannot be guaranteed. If an RODC is stolen or compromised, the damage is limited because it holds no writable copy […]
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