Msxblmultiplayer Link — Fix Updated [exclusive]

| Symptom | Cause | Impact | |---------|-------|--------| | Connection timeout ( ERROR 0x7A ) | Hardcoded UDP port 27015 + missing keep‑alive packets | 83% of link attempts failed | | Desync after 3 minutes | No timestamp‑based input reconciliation; absolute frames assumed | Character positions diverged visually | | Firewall blocks | No NAT hole‑punching or STUN support | Direct IP connection impossible for 47% of testers |