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Event ID: 4199 Source: TCPIP

The system detected an address conflict for IP address with the system having network hardware address <MAC>. Network operations on this system may be disrupted as a result.
I had this with an Intel Based server that had dual network cards installed. The cards were teamed and presenting a single IP address but after about 6 weeks we started to get the IP address conflict which turned out to be between the 2 cards themselves. Breaking and recreating the team resolved the issue although only time will tell if this is a permanent fix or whether it will happen again in a few weeks.
You will see this event if Windows detects a duplicate media access control address on the network. See ME164903 for details.
See the link to "EventID 4199 from source Tcpip" for details on this event.

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