SMB connection attempt switches to WebDAV unexpectedly when connecting to OSX server

With Windows 8.1, I can connect to my OSX 10.9.5 Server share point by opening File Explorer, typing: \\<fqdn> and hitting return. I will be prompted for server credentials and when I enter them, I will see the share point.
With Window 10, if I do the same thing, instead of seeing the shareppoint, I see a blank Windows Explorer screen with "This folder is empty".
I contacted Apple with a tcpdump from this and they said that Windows 10 is attempting to connect over HTTP instead of SMB:
ACTION: Windows is handling the connection incorrectly by attempting to use Webdav instead of SMB.
STATUS: As with any other 3rd party integration cases, we attempt to identify an issue as either an issue to a 3rd party product, or to identify and isolate the issue in
the Apple product.
In packet 64 the client sends an SMB 1 negotiate request (expected).  In packet 66 the server responds in SMB 2 with the SMB 2 features it supports
(expected).  In packet 67 the client sends the SMB 2 negotiation request (expected).  In packet 69 the server responds with the SMB2 negotiation response (expected).
Normally at this point the client will send an authentication attempt in SMB 2 using one of the authentication types provided by the server in packets 66 or 69.  Instead
the Windows client sends a tcp connection reset in packet 70 (unexpected).  In packet 74 the windows client initiates a connection over HTTP (extremely unexpected).
The above pattern repeats several times in the tcpdump.
The mac server never presented any HTTP information in the SMB packets.  This appears to be a purely Windows 10 issue.
If I connect to the server by typing: \\<fqdn>\sharepoint -- then I do connect, but the OSX server does not indicate this is an SMB connection, so it must be a WebDav connection (which would be incredibly wrong...)
If this is a settings issue in Windows 10 that is forcing an HTTP connection over an SMB attempt -- can somebody point me where to look?

On Thu, 20 Nov 2014 17:04:11 +0000, steve maser wrote:
According to Apple, it appears that if the SMB server (in this case Mac OS X 10.10.1) has port 443 open, Windows 10 attempts to connect over that instead of over the SMB port.
Anybody looking at this one?
If you want someone to look at this you need to file it using the Feedback
tool, if you haven't already done so.
Paul Adare - FIM CM MVP
Actually, we have scientifically determined that Heisenberg did indeed
sleep exactly here. However, we have no idea whatsoever just how fast
asleep he was. -- Dave Aronson

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