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The 401 Errors report contains a bar graph that allows you to view the top 10 requests that resulted in a 401 Unauthorized response code. A 401 Unauthorized response code occurs when the request does not contain the proper authentication credentials for content requested from your web server. For each asset in the bar graph, you can get a quick sense of how many requests resulted in a 401 Unauthorized response code by comparing the color-coded portions of the bar corresponding to it. The yellow portion of the bar indicates all of the requests that returned a 401 Unauthorized response code for that asset. The remaining red portion represents the requests that returned a different response code for that asset.
This report displays the data corresponding to the graph directly below it.