When nothing goes right, go left.
The best way to achieve this is by creating an account on NextDNS, then setting your phone to use the NextDNS DNS. On the web dashboard, look at the logs and blacklist anything from Google, Google Play, or anything else you don’t want. This not only works but also gives you more control over everything your phone is doing in the background, regardless of whether you’re using Wi-Fi or a mobile network.
Give a try to typewise
When someone writes to me in that way , first time gets a warning ⚠️ second time gets blocked 🚫.
It works out of the box without any other apps.
trough ssh when you connect to your machine run :
lastb -10
This will show you the last 10 login failed attemps you can change to 20 or whatever
you can also run: last -10 to see the last successful logged in
use :
more history
to see all the commands that someone have typed
on the dir /var/logs you have a lot of another logs too
for more paranoid level use
netstat -a
This will show you all incoming and outgoing communications
and like the others said considere using firewall and fail2ban
Note: don’t relly to much on firewalls since they are easy to bypass
keep all softwares updated
read frequently about new vulnerabilities if there is some vulnerability that affects your software until gets patched turn of that service.
It suffices for me if you don’t enable logs; there are no logs… and if you enable them, you can choose the country where the logs are saved and for how long.