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ERROR_IP_ADDRESS_CONFLICT1
What ERROR_IP_ADDRESS_CONFLICT1 means
The system observed an address conflict, commonly through ARP-based duplicate-address detection or contradictory network traffic. Connectivity can be intermittent because two devices answer for the same address.
Where it commonly appears
- Static IPv4 configurations
- DHCP scopes with stale or conflicting reservations
- Virtual machines cloned with fixed network settings
- Networks containing unauthorized devices or bridging mistakes
Likely causes
- Two hosts were configured with the same static address
- A DHCP lease overlaps a manually assigned address
- A stale reservation or failover issue allocated the address twice
- A virtual appliance was cloned without changing its address
- Proxy ARP or unusual network equipment produced a false conflict indication
Troubleshooting checklist
- Record the interface, address, prefix, gateway, DHCP status, and conflict timestamp
- Inspect the ARP table and switch forwarding table to identify competing MAC addresses
- Check DHCP leases and reservations
- Disconnect one suspected host at a time rather than repeatedly clearing ARP state
- Verify VLAN and bridge configuration
Guidance for developers
Network software should treat the address as unsafe until conflict resolution completes. Avoid binding critical listeners solely to the disputed address, and surface a clear diagnostic that includes interface identity.
Guidance for administrators
Remove the duplicate assignment, correct the DHCP scope, and renew the affected lease. After the conflict is fixed, clear stale neighbor state or bounce the interface if necessary.
Example
A printer retains a static address that was later added to the DHCP dynamic range. A workstation receives the same address and Windows reports this conflict. Excluding the static range and renewing the lease resolves it.
Related conditions
ERROR_IP_ADDRESS_CONFLICT2 represents the companion conflict notification used by Windows. Operational troubleshooting is the same: identify the other owner and correct address management.
References
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