SharePoint 2013 – 401 Unauthorised Error When Accessing My Sites Site Collection


In SharePoint 2013, once you’ve created a dedicated Web Application to host My Sites and a Site Collection with the My Sites Host template, you open a browser and enter the address of the new Site Collection which in this case is http://mysitesdev2013.domain.internal only to see a 401 Unauthorised error.

I set my My Sites web application with a host header URL, so I did make a DNS entry similar to http://mysitesdev2013.domain.internal.

Log files will display the following warning which is a good indicator of what the problem is:

8059 Warning Alternate access mappings have not been configured. Users or services are accessing the site http://servername with the URL http://mysitesdev2013.domain.internal. This may cause incorrect links to be stored or returned to users. If this is expected, add the URL http://mysitesdev2013.domain.internal as an AAM response URL. For more information, see:″/>


I solved this by creating an Alternate Access Mapping (AAM) for the dedicated My Sites Web Application in the Custom Zone. See image below:

Certified Solutions - SharePoint 2013 - My Sites - Alternate Access Mapping (AAM) For 401 Unauthorised Error

Derek Halstead is a SharePoint consultant as well as the founder and principal of and He has 16 years of experience in the IT industry, with over ten years focused on Microsoft SharePoint. He can be reached by using the Contact Me link in the top menu.
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