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ERROR_DHCP_ADDRESS_CONFLICT
The DHCP client has obtained an IP address that is already in use on the network. The local interface will be disabled until the DHCP client can obtain a new address.
ERROR_DHCP_ADDRESS_CONFLICT is Win32 error 4100 (0x1004) and belongs to DHCP address conflict detection.
Where the result appears
- DHCP client address configuration.
- Duplicate-address detection after receiving a lease.
- Virtual machine cloning or static address overlap.
- Network access control reacting to duplicate IPv4 use.
Likely causes
- another host is already answering for the offered IPv4 address.
- a static address lies inside the DHCP scope without a reservation or exclusion.
- a cloned system or stale virtual appliance retained an address.
- switch, wireless, or virtualization behavior exposed an unexpected duplicate.
Troubleshooting steps
- Record offered address, lease server, scope, and transaction identifier.
- Record ARP probes and replies including source MAC address.
- Record DHCP client and server event logs.
- Record switch forwarding table and virtualization inventory.
- Record static address reservations and exclusions.
What to verify
Verify whether another host is already answering for the offered IPv4 address. Check offered address, lease server, scope, and transaction identifier together with ARP probes and replies including source MAC address.
Handling, retry, and recovery
Keep the interface from using the conflicting address, identify the other MAC owner, correct the scope or static assignment, and request a new lease. Do not suppress duplicate-address detection merely to make connectivity appear restored.
Difference from nearby codes
It is not a generic DHCP timeout; a lease was obtained but rejected because the address was already active.
Practical example
A manually configured printer uses an address later added to the dynamic pool.
References
- Microsoft: System Error Codes (4000–5999) — reference for error 4100.
- Microsoft: DHCP client troubleshooting — reference for error 4100.
- Microsoft: Address Conflict Detection — reference for error 4100.
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