Query about cubecell and ttn

hi i am trying to connect cubecell to ttn via ht-m01 gateway.
i am experiencing 2 problems.

  1. i am able to connect to ttn and able to see traffic in application and gateway. i am able to see when i am connecting gateway with semtech packet forwarder running in background.
  2. as with the packet forwarder running in the background and able to see traffic, in arduino i am still seeing joining failed in serial monitor.
    my question is that can i connect cubecell to ttn via gateway by not running any software in background. and why i am seeing not joined in serial monitor