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I set up an OpenVPN server on my Raspberry Pi running Raspbian and am wondering if there is a log file of security events that I can look at. I'm curious because I want to know if there are login attempts via the now forwarded port that I should be looking at.

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The Raspberry Pi OS uses systemd, so you will find logs in its journal. It also contains the logging from the OpenVPN server. Look at it to the current boot with:

rpi ~$ journalctl --boot=0 --pager-end

You can filter it to the service:

rpi ~$ journalctl --boot=0 --unit=openvpn.service
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  • I tried this and was given a hint:Hint: "You are currently not seeing messages from other users and the system. Users in the 'systemd-journal' group can see all messages. Pass -q to turn off this notice. No journal files were opened due to insufficient permissions." So I then ran with sudo and got output. Router advertisements but not anything from OpenVPN yet.
    – ErikS
    Aug 16 '20 at 22:20
  • @ErikS Add user pi to group systemd-journal with sudo adduser pi systemd-journal, logout and login. I don't know how do you setup OpenVPN. Maybe you don't use its systemd services? That's default with installation from the RaspiOS repository. I have tested simple openVPN with static keys and found its output in the journal.
    – Ingo
    Aug 16 '20 at 22:36

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