MacOS VPN Log (random disconnects at about 20-30 min mark)

Question:

Is there any VPN logs on MacOS that I can "tail" / have a look at?

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I have found the following (from other forum searches I have done before submitting here):

/var/log/ppp.log does not exist
/var/log/ppp is empty
/var/log/system.log only prints the process ID on VPN connect, but no additional info when it fails, fails during connecting (assuming some handshake did not complete etc.)

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...more details 👉🏻

I am connecting to a VPN that I setup in my company on the Zyxel USD 60 Router, IKEv2.

This VPN works as expected until it randomly disconnects after about 20-30 mins. (Which of course breaks all my Terminal-sessions, other SFTP panels etc. = basically very dangerous to rely on)

This VPN has been properly working (no random disconnects) since Catalina / Big Sur (so since 2020)
Macbook 12" (Catalina) also since a few months has this disconnect problem
iMac 27" + Macbook pro 14" (Sonoma 14.1.1) have this problem as well

My setup in Zyxel USG 60:

*VPN Gateway

*VPN Connection

Posted on Nov 21, 2023 10:06 PM