To be fair, my "misbehaving corporate firewall" is actually my apartment that has building-managed internet wherein everyone is NAT'ed to the same fiber connect

To be fair, my "misbehaving corporate firewall" is actually my apartment that has building-managed internet wherein everyone is NAT'ed to the same fiber connection. For whatever reason, SYN flooding detection triggers when you do more than a few TCP connections per second which makes most TCP-based things super frustrating and their IT is clueless as to how to fix it.