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MITM capture showed MikroTik sends all-zero TCP data streams. Our server was setting packet[0]=0x07 (STATUS_MSG_TYPE), which MikroTik rejected. TCP mode has no status headers — just raw zero-filled data streams in both directions. Fixed in both server and client TCP TX loops. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>