Direct answer
Forwarding fails when the target IP changes, the service is not listening, host firewall blocks it, double NAT/CGNAT exists, or testing occurs from inside without loopback support.
What this covers
- The observed symptom matches this record
- Customer-accessible settings, connections and external components
- Diagnosis before reset, deletion or component replacement
What it does not cover
- ×A model-specific error code with a different documented meaning
- ×Internal electrical, battery-cell, gas, refrigeration or sealed-component repair
- ×A guarantee that every model exposes the same control label
Capture the exact symptom
ReversibleConfirm the service listens locally on the target device and record its current LAN and public WAN addresses.
Run the smallest isolation test
ReversibleReserve the target IP, allow the service in its firewall and compare the router WAN address with an external address.
Correct only the proven cause
ReversibleRemove double NAT or request a public address where appropriate; expose only the required authenticated service.
Verify before changing anything else
ReversibleTest from a separate cellular connection and inspect service logs.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check before resetting anything?+
Confirm the service listens locally on the target device and record its current LAN and public WAN addresses.
What is the safest isolation test?+
Reserve the target IP, allow the service in its firewall and compare the router WAN address with an external address.
When should I stop troubleshooting?+
Do not expose remote desktop, cameras or admin panels without strong authentication and current security guidance.
Answer for the exact device and software version shown above.