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This is a SharePoint 2016 system. No matter in what library, clicking on "open with explorer" does nothing - no error, no action. This is a problem for all users (IE11 on win10, mostly, but also on win8.1, server 2012/2008).

Thing is, if we copy the browser address bar and paste it into file explorer, it works, so at least we have a workaround, but then again reauthenticating is required.

With a cleanly setup SharePoint test system, it does not work, either, but at least we get this:

Screenshot

That test system has not seen any patch yet, maybe that is why it is "failing a little less".

The usual suspects were tried:

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    We have found out that the problem can be solved by changing part of the master page to http-equiv="X-UA-Compatible" content="IE=10" (on clean installations, it is "IE=9" and on our productive machine, we had set it to IE=Edge, because with IE=9, drag and drop does not work). Still, windows explorer is asking for credentials. Why can't it reuse those of the user that is logged on? Time for a new question.
    – MTG
    Commented Mar 8, 2017 at 15:13
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    Check this blog.devoworx.net/2015/03/23/…
    – Mohamed El-Qassas MVP ♦
    Commented Aug 11, 2018 at 9:03

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I have seen issues with "Open with Explorer" when "Trusted Sites" are managed by Domain Policy, and the list of trusted sites contain illegal wild-card URLs.

Check to see that all the other "Trusted Sites" are indeed legal URLs.

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Open with Explorer option does not work in IE 11. I have faced this issue. The trick is, open your IE developer tool and simply change the browser mode to IE 10 and then Open with Explorer option will start working.

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    Zakir, it is solved. Further changes to the master page were required. Thanks anyway.
    – MTG
    Commented Jun 12, 2018 at 8:49
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    Let us know what changes you had done in master page. I think most probably you would have updated the <meta http-equiv="X-UA-Compatible" content="IE=edge"> element?
    – Zakir HC
    Commented Jun 25, 2018 at 11:13

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