When a duplicate is detected the FCNT value is not reporting correctly in this version of network server. It is an uninitialized value.
In the next release of network server, the value is initialized to FFFFFFFF which may show in the FCNT if the packet cannot be authenticated.
In the server update when a duplicate is received the FCNT will be set correctly.
|CHECK-PKT|FCNT: 00000002 LAST-FCNT: 00000002 Duplicate: yes
Although the enableStrictCounterValidation is set to false, the network server will still filter out duplicate messages from being reported to the application. So if the end-device is sending 0 repeatedly the payloads are not forwarded to the application.