Accessing Sharepoint webservices from iPhone

In one of my application I need to use Microsoft Share-point Server.

But I cannot successfully authenticate through web-services.

I use _vti_bin/Authentication.asmx for login but I got "PasswordNo开发者_如何转开发tMatch" or 403 :Forbidden error.

I got Authentication Mode as "Forms". Any help?

One More Question is:

After a sucessfull login, how can I handle further request -getList/addList? Any additional processing needed?