Harden the device
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Harden the meter according to your company policies and standards.
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Review assumptions about protected environments and address potential risks and mitigation strategies. See Product defense-in-depth for details.
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Terminate the user account sessions in webages.
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Change the default passwords/passcodes. See Changing passwords/passcodes for details.
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Change the communication protocol ports from their default values. This lowers the predictability of port use.
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Disable communication protocol ports when they are not in use. This reduces the attack surface.