What is "Authentication failed" status on network adapter

I did not know that network adapter can even have status such as "Authentication failed":

Do you know what is causing this and how it can be resolved?

The network connection through this adapter is working normally. This makes this status information more confusing.

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3 Answers

Converting my comment to an answer. The problem occurs because the "Enable IEEE 802.1x authentication for this network" is checked under the Authentication tab of the Local Area Connection Properties. When you uncheck these boxes the problem will go away.

Your computer is probably using the 802.1X standard for connecting to some of the networks you use. The 802.1X is an IEEE protocol and a there's a nicely detailed explanation on Network Engineering:

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It works. Unselect Enable IEE 802.1x authentication for this network from Authentication Tab in Local Area Properties.

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I changed from Microsoft PEAP to Cisco PEAP and the problem went away. I can't explain why this resolved the problem for me, but my PC was able to authenticate.

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