Introduction to DHCP Server Authorisation on Windows Server 2019 DHCP Server Authorisation is an Active Directory feature that prevents rogue DHCP servers from operating in a domain environment. In a Windows domain, before a DHCP server will respond to client requests, it must verify that it is authorised in Active Directory. An unauthorised DHCP server […]
Introduction to DHCP with DNS Dynamic Update on Windows Server 2019 DNS Dynamic Update (DDNS) allows the DHCP server to automatically register and deregister DNS records on behalf of DHCP clients whenever they obtain, renew, or release IP addresses. Without DDNS, administrators must manually maintain DNS A records and PTR records every time a machine […]
Introduction to DHCP Failover on Windows Server 2019 DHCP Failover allows two Windows Server 2019 DHCP servers to share address assignment responsibility for a scope, providing high availability and load balancing for IP address leasing. Without failover, a single DHCP server failure means clients cannot renew leases or obtain new ones — which causes network […]
Introduction to Attack Surface Reduction Rules Attack Surface Reduction (ASR) rules are a set of targeted security policies in Windows Defender on Windows Server 2019 that block specific behaviors commonly used by malware and attackers—without requiring signature-based detection. ASR rules target abuse of Office macros, script execution techniques, credential theft from LSASS, exploitation of email […]
Introduction to Device Guard Device Guard is a set of hardware and software security features in Windows Server 2019 that locks down a device to run only trusted applications and drivers. It consists of two main components: Virtualization-Based Code Integrity (HVCI, also called Memory Integrity), which uses Hyper-V to protect the kernel from unsigned or […]
Introduction to Credential Guard Credential Guard is a Windows 10/Server 2019 virtualization-based security feature that isolates credential storage from the main operating system. Traditionally, the Local Security Authority Subsystem Service (LSASS) stores and manages credentials including NTLM password hashes, Kerberos tickets, and cleartext passwords (in some configurations). If an attacker gains kernel-level access or exploits […]
Introduction to NTLM Security NTLM (NT LAN Manager) is a challenge-response authentication protocol used by Windows when Kerberos is not available—for example when accessing resources by IP address instead of hostname, in workgroup environments, or when connecting to legacy systems. While Kerberos is the preferred protocol, NTLM is still present in virtually all Windows environments […]
Introduction to Kerberos Authentication Kerberos is the default authentication protocol for Windows domain environments. Introduced with Windows 2000 and continually improved in Windows Server 2019, Kerberos provides mutual authentication—both the client and the server verify each other’s identity—and uses tickets rather than transmitting passwords over the network. Understanding Kerberos is essential for troubleshooting authentication failures, […]
Introduction to Multi-Factor Authentication Multi-Factor Authentication (MFA) requires users to provide two or more verification factors before gaining access: something they know (password), something they have (phone, hardware token, smart card), or something they are (biometrics). Implementing MFA on Windows Server 2019 dramatically reduces the risk of credential-based attacks—even if a password is stolen, an […]
Introduction to Split Tunneling Split tunneling is a VPN configuration where only traffic destined for corporate resources is routed through the encrypted VPN tunnel, while internet traffic goes directly from the client through its local internet connection. Without split tunneling (full tunneling), all client traffic—including YouTube, Windows Update, and personal browsing—travels through the corporate VPN […]
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