Hi, im using a com+ app to query an oracle 10g database, i got the 10.2.0 Oracle client installed and the regedit keys configured correctly (oci.dll, oraclient10 and sqlora10 in HKLM/SOFT/Microsoft/MSDTC/MTxOCI) in a Win Server 2008 r2 sp1, if i put wrong credentials for database, it display the "user or pass invalid", so its connecting db, but when i put the rigth credentials, the app display "Cannot connect to the transaction manager or the transaction manager is unavailable", i checked in services.msc the Distributed Trnx Coordinator and is up, so i think the MSDTC is up too, any idea? thanks and regards.