Unable to enlist in a distributed transaction (Windows7, Oracle 11G R1)

Hi,
I have a .Net application running on Windows 7 x64 using VisualStudio2008 and Oracle 11G R1 32bit client
In it I call a webservice calling another webservice, this requires to use oramts that interfaces with Microsoft DTC. However I'm getting the following error when calling the service method:
"Unable to enlist in a distributed transaction"
I have checked the following:
- Ora MTS is installed
- DTC is running, the security settings allow AX transactions (in fact I just allowed everything)
- Network services have the permission to access oracle dlls
- The registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSDTC\MTxOCI contains the following: "OracleXaLib"="xa80.dll" "OracleSqlLib"="SQLLib80.dll" "OracleOciLib"="oci.dll" (not sure if this is right)
What is it I'm doing wrong ? Does this version of Oracle work correctly on W7 ?
By the way it works fine on Windows XP !
I've spend quite some time trying to find a resolution..
Thanks!

I think I answered my own question
It seems that MSDTC is not supported by Oracle 11G R1 on Windows x64 !
All Oracle Database components are supported on Windows x64 with the following exceptions:
•Oracle Services for Microsoft Transaction Server are not supported on Windows Vista. As a result, all Oracle Windows data access drivers on Windows Vista that use Oracle Services for Microsoft Transaction Server to enlist in Microsoft Distributed Transaction Coordinator (MSDTC) coordinated transactions cannot participate in those coordinated transactions. These data access drivers include Oracle Data Provider for .NET, Oracle Provider for OLE DB, Oracle Objects for OLE, and ODBC. Check OracleMetaLink for up to date information on Oracle Services for Microsoft Transaction Server certification with Windows Vista.
http://download.oracle.com/docs/cd/B28359_01/install.111/b32006/reqs.htm#CHDCEFIJ
Edited by: 845528 on 18 mars 2011 05:05

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          >> at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
          >>/////////////////////////////////////////////////////////////////////////////////
          >>
          >>Regards
          >>Ranga Rao
          >>
          >>
          >

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Hi,
this is information from metalink:
The ORA-2042 indicates that you should increase the parameter
distributed_transactions.
The ORA-2063 indicates that this must be done at the remote
database.
Explanation
If the distributed transaction table is full on either side of
the database link you get the error ORA-2042:
ORA-02042: "too many distributed transactions"
Cause: the distributed transaction table is full,
because too many distributed transactions are active.
Action: increase the INIT.ORA "distributed_transactions" or
run fewer transactions.
If you are sure you don't have too many concurrent
distributed transactions, this indicates an internal
error and support should be notified.
Instance shutdown/restart would be a workaround.
When the error is generated at the remote database it is
accompanied with an ORA-2063. In this case the parameter
distributed_transactions must be increased at the remote
database.
If there is no ORA-2063 the parameter distributed_transactions
must be increased at the local database.

SQL Anywhere 12 (12.0.1.4155) using EF : Unable to enlist transaction; DTC may be down

What may be causing this error??
Sometimes the transactions runs fine, and other times I get this error message.
Database.SqlQuery<int>("select dba.getnextid()");
NativeError: -803
Message: Unable to enlist transaction; DTC may be down
Source: SQL Anywhere .NET Data Provider
StackTrace:
at iAnywhere.Data.SQLAnywhere.SAException.CheckException(Int32 idEx)
   at iAnywhere.Data.SQLAnywhere.DurableResourceManager.Enlist(SAInternalConnection conn, Transaction tran)
   at iAnywhere.Data.SQLAnywhere.SAInternalConnection.Enlist(Transaction tran)
   at iAnywhere.Data.SQLAnywhere.SAConnection._EnlistTransaction(Transaction tran)
   at iAnywhere.Data.SQLAnywhere.SAConnection.EnlistTransaction(Transaction transaction)
   at System.Data.EntityClient.EntityConnection.EnlistTransaction(Transaction transaction)
Can't seem to figure out how to resolve this issue, nor what's causing it.

Enabling the MSDTC service solved it. (Distributed Transaction Coordinator)

Unable to enlist in a distributed transaction (Windows7, Oracle 11G R1)

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