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Event ID: 40 Source: E1000

Source
Level
Description
Intel(R) PRO/1000 MT Dual Port Network Connection Smart Speed has downgraded the link speed from the maximum advertised.
Comments
 
This event will be logged if the network adapter is unable to maintain a reliable link at the fastest advertised speed. There are likely one or more broken strands in the cabling between the adapter and the switch.

Ideally, the cabling and connectors should be inspected and replaced or repaired as necessary. If this is not possible, manually setting the link speed and duplex on the adapter and the switch to a lower speed may help improve the reliability of the link. If the speed and duplex cannot be set on the switch (if, for example, it is an unmanaged switch), be sure to set the duplex on the adapter to "half" to avoid a duplex mismatch.

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