Microsoft broke DHCP for Windows Server last Patch Tuesday
Briefly

Microsoft acknowledged that the June Patch Tuesday updates might disrupt DHCP services on multiple versions of Windows Server, potentially causing clients to lose their IP addresses and face network issues. This problem arises shortly after the patch installation, leading to serious connectivity problems for some users, while others seem unaffected. Despite the critical nature of the security update, the lack of a current workaround leaves network administrators in a precarious position, prompting them to reconsider applying the update until a resolution is released.
The DHCP Server service might intermittently stop responding after installing this security update, affecting IP renewal for clients on various Windows Server versions.
Affected users report that the service fails shortly after patch installation, leading to abrupt network connectivity issues.
Read at Theregister
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