We currently have the effect that when clicking Open with explorer in a document library we can't add / edit / change items. The folder opens but as soon as we try to add something the explorer.exe freezes. Same goes for mapping a library to a drive letter.

By default we access our intranet via http. About a year ago we added the option to access it via https. And when accessing our Intranet via https everything works fine.

Anyone else has this feature/bug? Is there a way to fix it (a patch that might have been responsible)?

We use SharePoint 2013 on Windows Server 2012 R2. Client OS is Windows 10.

Edit1: Here are our AAM / IIS settings: enter image description here enter image description here

Edit2: We just got hold of a laptop without the latest patches and the behavior is the same. So our Patchday wasn't the issue here.

Edit3: We tried rewriting the URLs through our KEMP load balancer but the result is a 'broken' intranet due to the hard links.

Edit4: taking a look with fiddler revealed that as soon as I try to create a new folder this happens (the blurred URL is always 'intranet.company.com): enter image description here

The only 302 message I can think of is the error page we set in IIS. But this has been made ~2 months before we encountered this issue. enter image description here

Edit5: Trying to upload a file (credits.txt) takes some time and then presents me with these messages including a 504: enter image description here enter image description here

  • Have you set up AAM for you intranet sites? If you set up AAM, then you need to access via https. Sep 8, 2020 at 10:11
  • Thanks for the comment but that does not fix this issue. Removing the https AAM entry (and its IIS binding) does not solve this issue. I updated the question with our AAM/IIS config. Also with these settings everything has been running fine for a year.
    – AM2FTW
    Sep 9, 2020 at 6:22
  • Is there a specific reason why you still have the option to access the application through HTTP? Sep 9, 2020 at 11:44
  • We still have lots of links within our Intranet (3000+ Site Collections) pointing directly to http ://intranet.company.com/*. Changing those manually would be 'challenging'. I also looked for PowerShell to help us here but couldn't come up with something (then again i am not super familiar with PS).
    – AM2FTW
    Sep 9, 2020 at 11:52
  • You could use URL rewrite to change all http:// requests to https://. Check this link
    – Sandro
    Sep 11, 2020 at 14:19

2 Answers 2


The Fiddler screenshot (edit3) indicates that the request #76 returns with a 302 i.e. it is redirected to the root and then results in a 401 (not authorised)

Can you try to grant the user read access to the root site on your farm? and then re-test?

Can you also try to disable the custom error page? (and restart IIS) would be good if we can exclude this as a cause.


  • Resetting the custom error page in IIS and the web.config did the trick. However I don't fully understand how it took so long for this behavior to show up(we set it almost 2 months ago) and why it threw a 404 message. Also all users have access to root site and that 404 page. THANK YOU for pointing us in the right direction!
    – AM2FTW
    Sep 14, 2020 at 6:59

I would fire up Fiddler and intercept the network traffic between the client and SharePoint. Can you establish a direct connection to one of the front-end servers by changing your local hosts file? This way you bypass the load balancer. Paul

  • Thank you. The load balancer is currently not being used. However Fiddler revealed that when trying to create a folder it answers with many 401 / 302 messages. I updated my initial question.
    – AM2FTW
    Sep 10, 2020 at 9:36
  • 1
    Cool. Great news.
    – Paul
    Sep 14, 2020 at 11:00

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