Is this issue resolved?
If it isn't, in the past I have configured the server OS setting that you are making the call to in the following area.
Start --> administrative tools --> component services --> component services --> computers --> my computer --> distributed transaction coordinator. --> local DTC
right click properties
enable the following check boxes (network DTS Access) which enables 'client and administration' and enable both of those
enable the allow inbound and allow outbound in the "transaction Manager Communication" and use radio button 'no authentication required'