MSDTC - how many ports are needed

firewall msdtc ports
Migol picture Migol · Mar 23, 2009 · Viewed 22.8k times · Source

I have a considerably large application that uses MSDTC. How many ports should I open? Is there any way to determine it?

EDIT: I know what ports I need to open, I don't know how many I need.

Answer

Duncan Edwards picture Duncan Edwards · Mar 23, 2009

When we've had to do this kind of debugging this article has been especially useful: How to troubleshoot MS DTC firewall issues. It includes an app called DTCPing which helps you to rapidly debug what the problem is.

As far as I remember the following ports were used:

TCP Port 1433 (Default port used by SQL Server)

UDP Port 1434 (Used by SQL Server)

TCP Port 3372 (Used by MSDTC.EXE)

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