I'm developing a (C#) n-tier application and have looked a little at COM+,
thinking it might be a good Data Access Layer Component.
But whenever I try to call a method on my COM+ component I get this error:

"The partner transaction manager has disabled its support for remote/network
transactions"

My component is placed on a WinXP machine, while the SQL Server 2000
database is installed on Windows Server 2003. Is this a problem?

I checked ALL checkboxes in the MSDTC | Security Configuration... | Security
Settings area on both computers as described here:
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=ORdkGu4SDHA.
1912%40TK2MSFTNGP12.phx.gbl

What am I doing wrong?

Here's a code-sample of my COM+ component (if it's any help?):

[Transaction(TransactionOption.Required)]
public class ComComponentForDBAccess : ServicedComponent
{
   public ComComponentForDBAccess()
   {
   }

   [AutoComplete]
   public string GetSomethingFromDB()
   {
       //... implementation here
   }
}

Any help will be greatly appreciated,
Kenneth