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How to set up a server to allow the root user to track down historical outgoing requests?

in flag

I woke up this morning and found an unexpected outgoing spike in traffic from my virtual server. Spike in outgoing traffic between 3 and 4 am

What commands/settings should I have been using to allow myself to track down the who/what initiated these requests, what was being sent and where it was being sent to?

Distributor ID: Ubuntu
Description:    Ubuntu 18.04.6 LTS
Release:        18.04
in flag
If you weren't already logging these information at that point (and if you were, you wouldn't need to ask now) the answer is most probably "none".
in flag
Noted. I'll updated my post accordingly
in flag
Apart from that, product recommendations are off topic.
in flag
Noted. I'll remove the request for tools and just leave a request of commands that would enable proper tracking.
A.B avatar
cl flag
A.B
auditd, acct or both come to mind
mangohost

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