I posted a question earlier this week about our IIS8.5/WebDAV setup: IIS8.5 with WebDAV only serves read-only files

I have the basics working, but now having trouble with mapping the WebDAV to a drive letter on a client PC (Windows 10).

My IIS setup looks like this:


The highlighted "Z-Drive" app points to the Z: drive on the server. Just below that is a separate Site (running on port #8080) that has the exact same setup (same physical path, same app-pool, same WebDAV Authoring Rules).

However, these 2 URLs behave very differently!

  1. http://server/Z-Drive can be mapped to a local drive letter on a PC, but it's read-only. Testing this with curl (curl --ntlm --u username:password -T file.docx http://server/Z-drive) returns a 409.0 error ("Conflict").
  2. http://server:8080 works properly with curl (same curl command copies the file to the server), but that URL cannot be mapped as a local drive letter. net use Z: http://server:8080 gives System error 1920 has occurred. I can map sub-folders of that Z: drive (net use Z: http://server:8080/subfolder), but I need the users to be able to get that whole Z: drive through WebDav, as one drive one their PC's.

I'm willing to use either URL (http://server/Z-Drive or http://server:8080), but one maps to a drive-letter as read-only and the other won't even map. Any suggestions for either problem?

1 Answer 1


I've found most WebDAV-Problems by enabling and analyzing the IIS Site Logfiles.

We used tworeferences to setup WebDAV - maybe one offers some help for you:

Unfortunately, compared to our other Linux WebDAV-Servers, the Microsoft IIS WebDAV service creates many problems - and Microsoft did not fixed them sincy many years. (E.g. we have problems with File Locking, Filename-Encoding, "long" filenames [we have 2016 and Microsoft could just use the right Win32 API which supports real long filenames], etc.)

Additionally, since many years the Windows WebDAV Client is very annoying: on some clients the WebDAV-Connection just works, while the same net use command just throw errors on other Clients. It also has problems with SSH-Certificates.

Therefore, we use 3rd party Software on the Clients to map WebDAV Drives - they are much more stable, often much faster and they behave identical on all of our Windows Clients.

Kind regards, Tom

  • When you mention a Linux WebDAV server, was it Apache? I could install that on the Windows server. I don't have to use IIS. Any recommendations for a Windows client?
    – jimtut
    Dec 10, 2016 at 16:46

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