Ntopng - Alerts query

Hi Folks

I just enabled ntopng on PFSENSE. Its now flooding my alerts window. I wanted to know what it was. Primarily the following errors/warnings are seen:

  1. Unidirectional UDP Traffic
  2. TLS (probably) not carrying HTTPS
  3. Missing TLS SNI

Any idea what these are about and if they can be resolved ?

Thanks