Publishing IIS 7.5 WebDAV site over HTTP

Hello,

We would like to publish HTTP IIS 7.5 WebDAV site over TMG 2010 but we have problems creating web publishing rule. The problem is that every time user tries to access WebDAV site using Windows Explorer we get the following error in TMG logs - 12202 Forefront TMG denied the specified Uniform Resource Locator (URL).

I believe something is wrong at authentification level but I can't find any information how to publish http WebDAV using TMG.

Is there maybe a tutorial on this issues?

Thank you!

Best wishes,

Marko