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Windows DHCP Server Ships With Conflict Detection Disabled by Default

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A default setting in Windows Server's DHCP service leaves conflict detection turned off, causing the server to hand out IP addresses already in use by other devices on the network. The issue, confirmed on Windows Server 2025 (build 26100.33296), stems from a 'Conflict detection attempts' setting that defaults to zero under IPv4 Advanced Properties. When a client receives a conflicting address, it detects the clash via ARP probing and sends a DHCPDECLINE, falling back to an APIPA address like 169.254.x.x and losing network connectivity entirely. The problem is not a bug but a deliberate default that has persisted since at least Windows Server 2003, and can silently affect IoT or embedded devices that skip client-side probing altogether. Administrators can mitigate the issue by manually setting 'Conflict detection attempts' to a non-zero value in the DHCP server's advanced settings.

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Windows DHCP Server Ships With Conflict Detection Disabled by Default · ShortSingh