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I require our firewall to allow ODBC connection from clients to the MS SQL Server.

Which ports should be opened for this?

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I think it is about time to accept an answer – spuder Jul 24 '13 at 21:56

According to MSDN:

Default instances of the Database Engine use TCP port 1433 by default.
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We opened these ports and that did the trick. We can ping the server and create an odbc connection to the server:

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