By default, an Application Object Server (AOS) instance runs on port 2712. Subsequent instances are assigned TCP/IP ports dynamically. You can set a different static port for an instance using the Server Configuration Utility.
You may want to set a different port when:
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The firewall you are using restricts you to use specific TCP/IP ports.
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You have multiple AOS instances running on a computer, and always want to know what they are.
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Open the Server Configuration utility ( Start> Administrative Tools> Microsoft Dynamics AX Server Configuration Utility).
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Verify that the currently selected AOS instance and configuration are the ones you want to modify.
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On the Application Object Servertab, in the TCP/IP portbox, type the port you want the instance to run on, click Apply, and then click OK.