I read this and then rooted around to see what this lynis thing is, installed it and ran it in audit mode and it flagged a lot of things but the one of most interest to me was the warning that I have no iptables set up so I am a sitting duck.
So I rooted around some more and found this.
https://www.thegeekstuff.com/2011/03/iptables-inbound-and-outbound-rules/
Completely crashed my communications. Locked in and locked out of the rest of the world.
iptables -F would not solve the problem.
Final fix, .sh file renamed so the computer could not recognize it, iptables -F, a reboot to get rid of any memory problems and now all is well.
In my haste, I forgot that my router is major protection and I am using noip for my IP and they are not allowing bad stuff to pass through.
Plus I use clamav very day.
I have never had an infected machine since I got rid of windoz, and that was when linux users had to build their own system. A long time ago.
A dumb impulsive result of letting bad information influence me.
Be careful.
Thank you for sharing that. :)