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This morning we noticed the message "A system update is scheduled for April 18th, adding communication port 15011 for device uniqueness verification. If using a private network, please open port 15011 to ensure proper device communication"
A more detailed description is provided in RMS product change notification notes here.
It is related to improving platform's security. The new port will allow to perform additional check of the device with a database, to confirm that the device connecting to RMS is real, unique and manufactured by Teltonika. In order to proceed with this check, an additional port must be opened.