Intro

I personally experienced slow downs and problems using ja-netfilter agent

i decided to inspect how jetbrains check for validity of licenses(because despite the fact i exclusivly told jetbrains to work-offline it still check the licesnse)

these are my conlusions: two domains are responsible for revoking invalid licenses:

• www.jetbrains.com
• account.jetbrains.com

you can either block them in your router or locally with these iptable commands

sudo iptables -I OUTPUT -p udp --dport 53 -m string --hex-string "|03|www|09|jetbrains|03|com|" --algo bm -j DROP
sudo iptables -I OUTPUT -p udp --dport 53 -m string --hex-string "|07|account|09|jetbrains|03|com|" --algo bm -j DROP

sudo ip6tables -I OUTPUT -p udp --dport 53 -m string --hex-string "|03|www|09|jetbrains|03|com|" --algo bm -j DROP
sudo ip6tables -I OUTPUT -p udp --dport 53 -m string --hex-string "|07|account|09|jetbrains|03|com|" --algo bm -j DROP

Warning

iptables will reset on reboot unless you make it persistent

to make iptable persistent on ubuntu (after running above iptable commands):

sudo apt install iptables-persistent
sudo iptables-save | sudo tee /etc/iptables/rules.v4 > /dev/null
sudo ip6tables-save | sudo tee /etc/iptables/rules.v6 > /dev/null

why these aggressive?

when i edited /etc/hosts jetbrains started to refuse the 127.0.0.1 as the validity server and started sending out udp requests to well known dns provides:

• 8.8.8.8
• 1.1.1.1
• 1.0.0.1
• 8.8.4.4
• 9.9.9.9

i was not expecting that so i decided to complettly ban inteiilj from being resolved on my system from any source,

License key

for now you can use this license key with above config

3XV70IG4VZ-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-ZB8GMi9TkpWWDc0vCjo/9clHmCNZrXbAuTeZukbm/fHWLPgzzTYXKAkY+hjUpG4C12gHSDCJ6yh81hD4+gOaCbLSejhZpAa88GxJR9wtDt3LqzfjaDPSRICi2E3dI81PvsQQNZDfl/5XcLcHSkeMDvg9ZT+/yAyUgpJWdgmRw+Dinjj7XdKdPNREBajB6/zs/tCLUI5zhySNC8Qf/IVhsWNxJh2ekpeHkOEBZ+lDSbIPfvOFVZu1GID36+bvJkS8CiIb08D1f9t6ubAyriQjfudRFAsfKykaUny1T6RNHzFoNr1aQvHTsQWrJmoEgd1drm8mJEKuye2xqI7v+u26lg==-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