Arch Linux

klapauzius

Member

Registered: 2019-07-22

Posts: 45

[Solved] can't find pid/process which connects to 92k.de

wireshark and ss -tunarp told me that my machine has been connecting to http://92k.de and https://92k.de - the purpose of that tcp-connection remains unclear.

 sudo watch ss -tunarp 

usually shows which process (including pid) is making the connection, but is sparing this information when it comes to the peer address 92k.de.

I blocked the traffic with iptables for now.

However, I'd like to get to the bottom of this.

Last edited by klapauzius (2019-09-22 10:34:36)

klapauzius

Member

Registered: 2019-07-22

Posts: 45

Re: [Solved] can't find pid/process which connects to 92k.de

Well, after blocking TCP traffic to this domain, several daemons try to reach it via UDP now.

edit: sorry, that's bullshit, I put 92k.de in /etc/hosts and let it point to 0.0.0.0, therefore

ss -tunaRp

resolved 0.0.0.0 as 92k.de, so I erased the entry since IPTABLES should do the trick...

Last edited by klapauzius (2019-09-22 10:02:12)

seth

Member

Registered: 2012-09-03

Posts: 61,171

Re: [Solved] can't find pid/process which connects to 92k.de

Hetzner Online GmbH, serverfarm.

Nmap scan report for 92k.de (95.216.99.37)
Host is up (0.048s latency).
Other addresses for 92k.de (not scanned): 2a01:4f9:2b:1245::2
Not shown: 991 closed ports
PORT     STATE    SERVICE
22/tcp   open     ssh
80/tcp   open     http
135/tcp  filtered msrpc
139/tcp  filtered netbios-ssn
443/tcp  open     https
445/tcp  filtered microsoft-ds
873/tcp  open     rsync
4000/tcp open     remoteanything
9001/tcp open     tor-orport

https://wiki.archlinux.org/index.php/Tor ?

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klapauzius

Member

Registered: 2019-07-22

Posts: 45

Re: [Solved] can't find pid/process which connects to 92k.de

nope, my machine is trying to reach port 80 and port 443

after blocking the IP of 92k.de, PACMAN can't reach the archmirrors anymore. 92k.de is not an arch-mirror, at least not in my mirror-files...

btw, tor.service is disabled and not running on my machine

REFLECTOR reaches the archmirrors, though

Last edited by klapauzius (2019-09-22 09:43:02)

klapauzius

Member

Registered: 2019-07-22

Posts: 45

Re: [Solved] can't find pid/process which connects to 92k.de

ok, updated the mirrorlist, pacman works again

klapauzius

Member

Registered: 2019-07-22

Posts: 45

Re: [Solved] can't find pid/process which connects to 92k.de

solved it myself, sorry for molesting the community, and thanks to seth for the hint...

92k.de is a FQDN pointing to the same IP where an arch-mirror is hosted, It's contacted by an update-script on my machine every 10 seconds. I have changed the intervall to 30 minutes now.

watch 'ss -tunarp'

doesn't show which process is doing that, because it usually picks up the connection in TIME-WAIT state.

Further reading for those who like to

https://serverfault.com/questions/23385 … ys-netstat
https://vincent.bernat.ch/en/blog/2014- … tate-linux

I have tried to catch the pid of the process opening the connection by

 lsof | rg port-number

but due to the short-living nature of these connections this information obviously is lost in time and space forever.

Last edited by klapauzius (2019-09-22 11:11:55)