DHCP Archives

Winsage

February 28, 2026

Announcing Windows 11 Insider Preview Build 28020.1673 (Canary Channel)

Windows 11 Insider Preview Build 28020.1673 has been released to the Canary Channel. Key updates include: - Emoji 16.0 release with new emojis available in the emoji panel. - Introduction of a sign-in restore experience for Windows Backup for Organizations, reinstating user settings and Microsoft Store apps. - Quick Machine Recovery (QMR) is now automatically enabled for enterprise-managed Windows Professional devices. - A built-in network speed test accessible from the taskbar for measuring network performance. - Enhanced account menu in the Start menu directing users to Microsoft account benefits. - Pan and tilt controls for supported cameras available in the Settings app. - Widget Settings have been updated to a full-page experience. - Search function in the taskbar now displays group headers with the number of results and allows previewing results. - Support for Remote Server Administration Tools (RSAT) on Windows 11 Arm64 devices. - Improvements to dark mode in File Explorer and fixes for unexpected window behavior. - Reliability improvements in Settings for Bluetooth & Devices options. - Enhanced reliability for sending larger files via nearby sharing. Features are gradually rolled out, and a clean installation is required to exit the Canary Channel.

Winsage

February 17, 2026

Microsoft Windows 11 KB5077181 Update Triggers Infinite Restart Loop on Some Devices

Microsoft's Patch Tuesday update, KB5077181, released on February 10, 2026, has caused significant boot failures for users of Windows 11 versions 24H2 (OS build 26200.7840) and 25H2 (OS build 26100.7840), resulting in endless restart loops. Users are reporting over 15 reboot cycles, preventing access to their desktops. Issues include System Event Notification Service (SENS) errors and DHCP problems affecting internet connectivity. Installation errors with codes 0x800f0983 and 0x800f0991 indicate potential hardware, driver, or servicing stack incompatibilities. The update was intended to address 58 vulnerabilities, including six zero-days, but the boot loop issue has overshadowed these enhancements. CVE IDs and their CVSS scores related to the vulnerabilities addressed include: - CVE-2026-21510: 7.5 - CVE-2026-21519: 7.8 - CVE-2026-21533: 8.8 - CVE-2026-20841: 7.1 As of February 15, 2026, there is no "known issues" entry in Microsoft's release notes despite user reports. Users can uninstall the update through the Control Panel if their systems are accessible, or use the Windows Recovery Environment to execute commands for uninstallation if their systems are unbootable.

Winsage

February 17, 2026

Windows 11 KB5077181: Update causes boot loops, DHCP errors, and sign-in failures

Wibu-Systems has partnered with Microsoft Learn to enhance educational initiatives aimed at equipping developers and IT professionals with tools and knowledge for implementing effective security measures in software development. This collaboration integrates Wibu-Systems' security solutions into Microsoft's educational framework, promoting best practices for application protection and reducing vulnerabilities. The partnership addresses the growing demand for secure software solutions and positions Wibu-Systems as a leader in the market.

Winsage

February 16, 2026

Windows 11 KB5077181 Security Update Causing Some Devices to Restart in an Infinite Loop

Microsoft's security update KB5077181, released on February 10, 2026, for Windows 11 versions 24H2 and 25H2, has caused critical boot failures, leading to infinite restart loops for users. The update addresses 58 vulnerabilities, including six zero-day exploits, and introduces new Secure Boot certificates. Users have reported errors such as “a specified procedure could not be found” and DHCP failures, with installation errors like 0x800f0983 and 0x800f0991 affecting specific hardware. To resolve issues, users are advised to uninstall the update and pause Windows Update. Accessing the Windows Recovery Environment may also be necessary for persistent boot loops. While some users experienced improvements, the overall instability highlights risks associated with updates. Microsoft has not acknowledged any known issues related to this update as of February 15.

Winsage

September 23, 2025

7 ancient Windows commands that are still helpful for troubleshooting today

The Windows Command Prompt is a key tool for PC troubleshooting, especially for IT professionals. - Netstat -a -n -o: Initial release in 1983; used for diagnosing network errors by revealing active connections, ports, and their states. Parameters -a, -n, and -o provide additional insights. - Ping -n 100 IP or webaddress: Initial release in 1983; checks connectivity to a network location, measuring latency and hops. The -n parameter specifies the number of packets, and the -t option allows continuous testing. - ipconfig /release and ipconfig /renew: Initial release in 1998; essential for displaying network hardware status and resolving IP conflicts by refreshing network configurations. - DISM /Online /Cleanup-image /RestoreHealth: Initial release in 2009; maintains Windows installation images by checking and repairing the Windows Component Store. - Sfc /scannow: Initial release in 1998; verifies and repairs the integrity of the operating system, useful for resolving certain errors. - powercfg.exe /hibernate off: Initial release in 2004; disables hibernation to free up disk space by deleting the hiberfil.sys file. - OOBEbypassnro: Initial release in 2020; allows bypassing Microsoft account registration during Windows 11 installation, though its future is uncertain due to planned removal in an upcoming update.

Winsage

August 14, 2025

Microsoft fixes Windows Server bug causing cluster, VM issues

Microsoft has resolved an issue affecting the Cluster service and virtual machine restarts after the installation of July's Windows Server 2019 security updates. The problem, acknowledged in a private advisory, involved the Cluster service malfunctioning after the KB5062557 update, causing nodes to fail to rejoin clusters and virtual machines to experience multiple restarts. The August 2025 KB5063877 cumulative update has fixed this issue, requiring the prior installation of the KB5005112 servicing stack update. Additionally, Microsoft addressed a WSUS problem affecting the deployment of the August 2025 KB5063878 update on Windows 11 24H2 devices and resolved a DHCP service freeze issue caused by June 2025 security updates in the July 2024 cumulative updates.

Winsage

July 22, 2025

Microsoft: Windows Server KB5062557 causes cluster, VM issues

Microsoft has identified an issue with the Cluster service on Windows Server 2019 following the installation of the July security update KB5062557, released on July 8th. This issue causes the Cluster service to repeatedly stop and restart, leading to nodes failing to rejoin the cluster, entering quarantine states, and causing virtual machines to restart multiple times. Administrators using BitLocker on Cluster Shared Volumes may also face additional errors. Microsoft has advised affected organizations to contact their business support teams for assistance while a mitigation strategy is being developed. Additionally, Microsoft is working on a resolution to be included in a future Windows update.

Winsage

June 27, 2025

How to configure multiple DHCP scopes on one Windows server

Administrators use the Dynamic Host Configuration Protocol (DHCP) service to manage IP address configurations for clients efficiently. Deploying multiple DHCP scopes on a single server is more practical than having separate servers for each subnet. DHCP operates through a four-step lease process: discover, offer, request, and acknowledge. To install a DHCP server, the PowerShell cmdlet Install-WindowsFeature DHCP -IncludeManagementTools is used, and the server must be authorized in Active Directory. A single DHCP server can manage multiple scopes, each with specific configurations for different subnets, such as DevNet, ProdNet, SalesNet, and EngineersNet. Each scope can have unique IP address ranges and settings, and additional scopes can be created by adding network interface cards (NICs) to the server. Server options apply globally, while scope options are specific to individual scopes. Reserved IP addresses can also be configured within each scope.

Winsage

June 18, 2025

Microsoft broke DHCP for Windows Server last Patch Tuesday

Microsoft has acknowledged that the updates released on June 10 during Patch Tuesday may disrupt the Dynamic Host Configuration Protocol (DHCP) service on Windows Server versions 2025, 2022, 2019, and 2016. The DHCP Server service might intermittently stop responding after installing this security update, causing issues for network administrators as clients may be unable to renew their IP addresses. There is currently no viable workaround for affected users other than rolling back the patch, which is not ideal due to the critical security fixes included in the update. The impact of this issue varies among users, with some experiencing significant problems while others report no disruptions. Microsoft is working on a resolution and will provide further information soon. Additionally, Microsoft has faced challenges with its Surface Hub v1 devices, requiring an out-of-band update.

Winsage

June 16, 2025

Windows Server update may disrupt IP refreshes

Microsoft has acknowledged that the June security update has caused complications for users of Windows Server systems, specifically affecting the Dynamic Host Configuration Protocol (DHCP) service, which is failing and leading to improper functioning of IP refreshes. The issue impacts multiple versions of Windows Server, including 2016 (KB5061010), 2019 (KB5060531), 2022 (KB5060526), and 2025 (KB5060842). Users have reported that the DHCP service may stop responding after installing the update, with one administrator noting their 2016 server crashed shortly after the update was applied. Microsoft is working on a solution and advises affected users to uninstall the update to restore functionality. The company has a history of DHCP-related issues dating back over a decade and has faced other problems with Windows Server updates in the past year, including issues with keyboard and mouse inputs and authentication challenges.