Limiting services to a limited set of ports, if this forum post is still relevant today https://ubuntuforums.org/showthread.php?t=1780657 https://ubuntuforums.o

Limiting services to a limited set of ports, if this forum post is still relevant today https://ubuntuforums.org/showthread.php?t=1780657 https://ubuntuforums.org/showthread.php?t=1780657 Regarding how to do that, it's left as an exercise to the PhD holding student.