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Event ID: 4 Source: B57NT4

Source
Level
Description
The network link is down. Check to make sure the network cable is properly connected.
Comments
 
This event is reported by a network adapter driver when it cannot physically communicate with the network (no signal). A typical example is when the network cable gets unplugged but there could be other causes as well. See the "What are the common reasons for a link to be down?" article for more details and suggested troubleshooting.

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