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The DPMA is a licensed Sangoma product and is tied to the system's MAC addresses at the time the "register" utility was run.  Once generated, you can't move the license file to another system and changing MAC addresses on a currently licensed system (such as when a network card is replaced) will cause the license validation to fail.   It's also possible that adding or removing VLANs, bridges, bonds and other virtual network interfaces could cause the license validation to fail since it's not always easy for the licence validation process to distinguish between physical and virtual interfaces. In these cases, you should re-run the "register" utility to generate a new license file.  If you encounter issues with this process, contact Sangoma Technical Support.

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