first of all, sorry for making you do my homework
I have two NGINX hosts, one is set up as
proxy_pass http://my second super secret ip:3333;
other one is set up as
proxy_pass http://some real scary government domain:3333;
and there is a host sending data over to my first server
which leads to access_log entries like
source server out of my control IP - - [date] "hexadecimal string" 400 157 "-" "-" "-"
but the second server iptables rules doesn't show any increase in traffic
except if I query with curl to the first server and port - I do get the 502 response from the second server (if I modify the config to reply me something else, like 200 - I do get it)
I don't request you to solve this
but please point me into some troubleshooting direction