ASP and MSDTC on a clustered SQL server

Hello, first of all i show you the error i’m getting every time:

Microsoft OLE DB Provider for SQL Server error ‘8004d00a’

MSDTC on server “ServerName” is unavailable.

I think that the problem is that the ip-adress of the sql server is different from the msdtc. In fact I can live with that, but ASP doesn’t. When I work with ASP transactions I open a connection to the SQL server, but that connection doesn’t find the msdtc. How can you fix that? Can anyone give me a reasonable explanation of how to make it work? Thanx in adv.