MSDTC - how many ports are needed

Question

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.

This is not offensive. Probably the users downvoted and marking offensive don't know what MSDTC is! — BobbyShaftoe, Mar 23 '09 at 15:26
Whoever is marking offensive: PLEASE read the FAQ- if it's not hate speech, spam, or full of curse words use CLOSE not offensive. — Dave Swersky, Mar 23 '09 at 15:28

score 9 · Answer 1 · answered Mar 23 '09 at 15:35

9

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)

answered Mar 23 '09 at 15:35

Duncan Edwards

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1434 Is for SQL Browser – RonaldPaguay May 13 '20 at 16:24

score 6 · Accepted Answer · answered Jun 09 '09 at 09:35

I think Migol wants to know how big the range of the RPC dynamic port allocation should be.

In the KB they mention a minimum of 100 ports

Furthermore, previous experience shows that a minimum of 100 ports should be opened, because several system services rely on these RPC ports to communicate with each other.

So I would design a benchmark application to test different values of your dynamic range.

MSDTC - how many ports are needed

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