Honeywell | 8
2 Security Guidelines
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Contact your local Honeywell Process Solutions Customer Contact Center (CCC) or our
https://process.honeywell.com/us/en/site/elster-instromet/support
2.4 Preventing unauthorized external access using a firewall
To reduce the risk for your network, we recommend that you use a firewall or another mechanism to
restrict network traffic between the “external” central billing or control system and the “internal” net-
work of the gas metering systems. Furthermore, CloudLink 5G device should only be installed in the
gas metering system, where access control is guaranteed, i.e., protective action is taken to prevent
unauthorized persons gaining access to the device.
We also recommend that you only allow protocols and ports which are actually used for data
exchange with the external network and that these are added, for example, to the firewall’s whitelist.
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