LND attributes every failed HTLC attempt to a specific position in the route via the 

 field. Since intermediate failures come back to you as encrypted error onions that only the sender can decode, LND decodes them and records exactly which node reported the error on each attempt.

) streams every HTLC attempt. Failed ones look like:

"htlcs": [{
  "status": "FAILED",
  "route": { "hops": [ {"pub_key": "02aa...", "chan_id": "..."}, ... ] },
  "failure": {
    "code": "TEMPORARY_CHANNEL_FAILURE",
    "failure_source_index": 2
  }
}]

lightning

I tested 27 lightning addresses: 7 cannot receive, and nobody is told

b6fec473d4

LND attributes every failed HTLC attempt to a specific position in the route via the `failure_source_index` field. Since intermediate failures come back to you as encrypted error onions that only the sender can decode, LND decodes them and records exactly which node reported the error on each attempt.

**Live:** `lncli trackpayment <payment_hash>` (RouterRPC `TrackPaymentV2`) streams every HTLC attempt. Failed ones look like:

```
"htlcs": [{
  "status": "FAILED",
  "route": { "hops": [ {"pub_key": "02aa...", "chan_id": "..."}, ... ] },
  "failure": {
    "code": "TEMPORARY_CHANNEL_FAILURE",
    "failure_source_index": 2
  }
}]
```