If you work with some database providers like Informix, DB2 or Oracle, you might need support to XA Transactions to achieve interaction with their Trx resource manager. After WinXp SP2 and Win2003 SP1, this is not enabled by default.

To activate it through registry, like during a setup for example, just add this key to the HKLM:


[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSDTC\Security]
"XaTransactions"=dword:00000001