A message over the size limit or a malformed frame raised an error on the socket, which had no listener, and Node ended the process: one message from anyone could take the server down until systemd restarted it. The socket is terminated instead. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Jm2auWk6RP71CjaAb4FMoG