3.6.0 MxDB for SQL Server Installation and Administration Guide (5697-7088, December 2007)

Appendix B: Hosting Configurations for MS DTC 146
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INFO: Configuring Microsoft Distributed Transaction Coordinator (DTC)
to Work Through a Firewall:
http://support.microsoft.com/kb/250367
How To Troubleshoot MS DTC Firewall Issues:
http://support.microsoft.com/kb/306843
MS KBs on DTC:
http://support.microsoft.com/search/default.aspx?qu=dtc+firewall