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ERROR_IP_ADDRESS_CONFLICT2
What ERROR_IP_ADDRESS_CONFLICT2 means
This constant conveys the same practical condition as the first IP-conflict status: the local address is not unique on its broadcast domain. The separate values originate from internal notification paths, not from two fundamentally different remediation procedures.
Where it commonly appears
- Duplicate-address detection during interface configuration
- DHCP lease activation
- Resume from sleep on a changed network
- Virtual and physical adapters sharing copied configuration
Likely causes
- A duplicate static assignment exists
- DHCP state is inconsistent across servers
- A sleeping host returned while its old address had been reassigned
- A cloned system preserved network configuration
- Layer-2 segmentation is not operating as expected
Troubleshooting checklist
- Capture both MAC addresses observed for the IP
- Check DHCP server logs around the lease time
- Inspect whether the event follows sleep, migration, or VM restore
- Validate switch port and VLAN membership
- Confirm that only one active interface is intended to own the address
Guidance for developers
Do not distinguish user-facing remediation solely by conflict1 versus conflict2. Normalize both to an address-conflict incident while preserving the original code in telemetry for low-level diagnosis.
Guidance for administrators
Assign a unique address and correct the source of duplicate allocation. Reserving addresses outside the dynamic pool and maintaining authoritative IP inventory prevents recurrence.
Example
A VM snapshot is restored on the same network while the original VM is still running. Both instances announce the same address; Windows raises this conflict variant. Changing the clone identity and network configuration is required.
Related conditions
This is not a DNS-name collision. DNS can be correct while the underlying IP address is duplicated, so name-server changes alone do not solve it.
References
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