WebDAV Lion Server
 

Has any body been able to get OmniPlan Accounts to work with Lion Server WebDAV?

If SSL is enabled in OmniPlan, I get:
[COLOR="DarkRed"]The certificate for this server is invalid. You might be connecting to a server that is pretending to be "xxx.yyy.com" which could put your confidential information at risk.[/COLOR]
(if I click the Test button in this mode, and enter my admin password to update my local Trust Certificate, I get the same error as below:

I am not currently running SSL, as I am just testing the system right now, so when I uncheck the "Use SSL" box in OmniPlan, I get:
[COLOR="DarkRed"]Server error 405: The server does not recognize WebDAV commands. This may be an invalid address.[/COLOR]

Web Services is running on the server
File Sharing is running on the server
I have created a folder, shared it and enabled the "Share with iOS devices (WebDAV)" checkbox using Server.app

Ideas?