App Not Working — Alien Dvr

| Tool | Action | |------|--------| | | Ping DVR’s IP – if no reply, DVR is offline or network cable bad | | Telnet (port 23) | If open, DVR is alive | | Port scanner | Check 37777 and 37778 – if closed, DVR firewall or port forwarding is wrong | Quick Summary | Symptom | Most likely fix | |---------|----------------| | “Connection refused” | Wrong IP or port | | “Device offline” | DVR disconnected from router | | App crashes | Clear cache / reinstall | | Remote viewing fails | Port forwarding or P2P setup incorrect | | QR scan doesn’t work | Use Xmeye app instead |