Panasonic FP Web-Server2 Hardware And Configuration Manual page 61

OpenVPN client
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control. As soon as the OpenVPN client function (see p. 58) is enabled,
certain internal data registers in the PLC will be polled by the FP
Web-Server at regular intervals to detect when an OpenVPN connection has
to be started.
Disable this function if not used to save the FP Web-Server's memory.
For more detailed information, refer to the online help under the keyword
"OpenVPN client settings".
FP Web-Server V2.810 EN