Source: Tcpip Event ID: 4201 (Windows Operating System 5.2) - Technet Events And Errors Message Center: Message Details

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Details
Product:	Windows Operating System
Event ID:	4201
Source:	Tcpip
Version:	5.2
Symbolic Name:	EVENT_TCPIP_MEDIA_CONNECT
Message:	The system detected that network adapter %2 was connected to the network, and has initiated normal operation over the network adapter.

Explanation
This is a normal event that indicates your network adapter is ready for normal operation.

User Action
No user action is required.

Related Knowledge Base articles

	You can find additional information on this topic in the following Microsoft Knowledge Base articles:
	• Advanced network adapter troubleshooting for Windows workstations
	Lists various causes for network adapter problems for Windows workstations and provides troubleshooting steps.