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SharePoint 401 unauthorized on _layouts/15

I'm working on SharePoint 2013 Enterprise since 3 months now. But I encounter an BIG issue now (and I don't know why). When I load the Central Administration page, I've a lot of GETs (in 401 ...
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3k views

SharePoint 2013 Workflow Authentication Error 401

I'm trying to let a SharePoint 2013 workflow run as a regular user (not a site collection administrator). When starting the workflow it fails right away with the error: RequestorId": ...
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554 views

Http 401 entries in IIS log of SharePoint Server

I am trying to fix a performance problem on a WSS 3.0 clustered site. Each server has ca. 30000 requests per hour, but ca. 90% are of type: 2010-10-13 10:00:05 W3SVC14309999999 servername ...