![]() Here's how my access attempt looks like in the IIS log: When it does, if I try logging in from another browser or from the same browser's Incognito mode, I get a 401 Unauthorized again. I cannot find any pattern of when the login suddenly starts working from my machine. I guess this is part of the reason why browsers display an "Unexpected error" instead of clearly saying it's a 401. If I leave the SharePoint page in the browser open overnight, and then come back and try to execute any XHTTP request to the server, the response from the server seems unusual - instead of the 401 the Network tab in Chrome's Dev Tools says it failed to load request or response data, and that the headers are "provisional", meaning that they were not even sent. ![]() I don't have any special software on my machine like firewalls or anti-virus software. What's weird though is that I thought it's using HTTP authorization (a simple window pops up in the browser), but the response in Wireshark somehow mentions NTLM. But my login credentials are 100% correct (including the domain name) and work fine on other machines. If I spy on the packets using Wireshark, I see that the server returns 401 UNAUTHORIZED. SP Designer just shows the login prompt again, while the browser just displays a generic "Unexpected error" message standard for each browser. I am trying to use both the System Account and various user accounts. However, I cannot access it most of the time, I'd say 90%, from my Windows 10 machine, both through the browser and using SharePoint Designer 2013. ![]() Here are the "claims based" authentication settings for the web application in SharePoint Central Administration: I have no problem accessing it from the server itself, as well as from various machines outside, including even from mobile Chrome browser. ![]() I have a SharePoint 2013 server using what I assume is standard HTTP authorization for access. ![]()
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