Using Windows XP SP2, Windows Server 2003 SP1 and MSDTC on Clusters

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In order to allow Windows XP SP2 or Windows Server 2003 SP1 to talk to a remote MSDTC located in a cluster, the security level for MSDTC needs to be set to "Incoming Caller Authentication Required". (see https://blogs.msdn.com/florinlazar/archive/2004/06/18/159127.aspx for more details on MSDTC security levels).