Moving Webdav app from Win server 2k to Win server 2k3 now getting authentication issues

I have an intranet web app that uses CSS httpFolder to map a webdav folder to an IFrame on a web page. The user then can drop files in the frame and the page processes them when the user presses the button.

This works well on a Win 2k SP4 server running IIS 5. I have moved the app over to a Win 2k3 server running IIS 6. I have made sure the WebDAV extensions are allowed. I have set everything else in II开发者_开发知识库S to match the original installation on the old server. But when I try to access the WebDAV folder I am repeatedly prompted for my login credentials. I use my domain admin login but even that doesn't work.

What am I missing? What differences are there between WebDAV on 2k vs 2k3?

TIA John

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After using Fiddler to see what was going on in the page requests I had to modify the web.config to recognize the missing verbs.