L2TP with IPsec VPN failing on some networks

An update on this topic.

I’m no longer having this issue. My VPN connections from the university work fine.

What’s different?

  • I upgraded my Balance One from firmware 8.4 to 8.5
  • I upgraded my macBook to the latest macOS (Sonoma 14.6.1)
  • (possibly) the university made some changes in their firewall settings?