a look on google gave me this
783
TCP UDP
HP Performance Data - Alarm Manager
search for "tcp port 783" on google and you'll probably find a bit more info about it
Found another one too
"
> What is the hp-alarm-mgr entry? And equally strange for me is the rndc
> from the bind9-package, why its it listening on a port, and how/can I
> remove it.
use:
fuser -n <proto> <port>
to determine which process is using which port, from there you
can use something like dpkg -S /path/to/program to find out which
package it belongs to"
Good luck