SharePoint 2013 Mistake 401 Illegal on /_layouts/15/start.aspx

I experienced this mistake these days, along with a log concept in the ULS saying: cannot discover website search details for demand Uri

When browsing directly to the site home page or any other page it worked perfectly. Just this page /_layouts/15/start.aspx returned access denied error.

I googled googled, and even binged but could not find a solution.

Until it occurred to me – alternate access mappings!!!

It appears I didn’t set the site URL as an alternate access mapping for this web application.

A quick trip to central administration fixed that:

Client on “Configure alternate access mappings”:

Change to your web application:

Click “Edit Public URLs

And add your new header in any of the text boxes:

Done! Now it is operating as expected

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