Whenever a windows user tries to connect to a Mac OS X Server 10.7.5 server over https, an error is given and the user is unable to connect. The error is Connection failed. Not found. I/O Error. I'm attaching a screen capture of the error window.
Using Cyberduck on a Mac with the exact same settings works flawlessly. Additionally, I can create a web folder on Windows to connect to the WebDAV server without issue.
The server has a signed and verified SSL certificate and is simply behind a router's firewall with port forwarding enabled. No proxies are involved on either end. More than one Windows user, from separate locations, has reported the same issue and same error.