OpenVAS Vulnerability Scanner is one of the world most advanced Open Source vulnerability scanner available today. For some reasons, you might find that the OpenVAS server (openvassd) didn't run properly as expected after loading all plugins.
To check OpenVAS Client & Server connection, we can issue this command:
root@bt:/usr/local/sbin# lsof -i
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
cupsd 5491 root 2u IPv4 18281 TCP localhost:ipp (LISTEN)
nessusd 5759 root 4u IPv4 18917 TCP *:nessus (LISTEN)
nessusd 5759 root 6u IPv6 18920 TCP *:nessus (LISTEN)
nessusd 5759 root 8u IPv4 19018 TCP *:8834 (LISTEN)
dhclient 6245 root 5u IPv4 22498 UDP *:bootpc
openvassd 30053 root 4u IPv6 61325 TCP *:9390 (LISTEN)
OpenVAS-C 30065 root 5u IPv4 61625 TCP localhost:52713->localhost:9390 (ESTABLISHED)
openvassd 30069 root 6u IPv6 61346 TCP localhost:9390->localhost:52713 (ESTABLISHED)
OpenVAS server listens on TCP port 9390 by default.
