December 07, 2025 #linux
Recently, I tried to set up a network tunnel to access some of my services running on a free-tier Oracle Cloud ARM compute instance. Despite correctly setting the ingress rules and iptables and ufw, there was a problem with opening the UDP port. Then I made a stupid mistake: I routed all the server's traffic through the closed port.
AllowedIPs = 0.0.0.0/0, ::/0
And
Immediately, my SSH connection was closed. All my running services stopped responding.
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