Event ID: 4201 Source: Tcpip

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Event ID: 4201 Source: Tcpip

Source

Tcpip

Level

Information

Description

The system detected that network adapter Intel(R) PRO/100 VM Network Connection was connected to the network, and has initiated normal operation over the network adapter.

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Comments

EventID.Net

This is just an informational message and occurs for Windows servers (clustered or not) and Windows workstations. Windows detects the LINK activation for the Ethernet 10/100BaseT adapter. But it is a very good indication for situations when there is a cable problem or switch/hub issue.

Anonymous

In my case this problem was caused by a switch problem. I replaced the switch with a new one and the event disappeared.

Raf Sura

I was getting this event every few seconds after I recovered my corrupted hard drive. A router restart solved the problem.

Joe Goldsmith

I came across this error on a system. The System Log was full of these events. I noticed that the wireless network icon was indicating that Windows was trying to acquire a network address. I had changed the WPA-PSK password recently and had not updated it on the machine. Every time the machine tried to update (about every 10 seconds) it recorded an error. I updated the password and the error has gone away.

Selma

I was getting literally thousands of 4201 error messages on my server over a three-week period. It turned out that the switch was failing. After I replaced the switch, the problem ceased to reappear.

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