DHCP service Archives

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.

Winsage

June 16, 2025

Microsoft: June Windows Server security updates cause DHCP issues

Microsoft has identified an issue with the June 2025 security updates that causes the Dynamic Host Configuration Protocol (DHCP) service to freeze on certain Windows Server systems. This affects the service's ability to apply renewals of unicast IP addresses, impacting network operations. Microsoft has acknowledged that the DHCP Server service may intermittently stop responding after the update and is working on a resolution. Additionally, other issues affecting Windows Server systems have been addressed, including application failures and authentication problems on domain controllers. Out-of-band updates were previously issued to fix bugs causing Hyper-V virtual machines to restart or freeze, and emergency updates were released for issues with Windows containers on certain Windows Server versions.