LND node fails to send almost all payments to Phoenix wallet (logs included)

[guitarchair]

Llightning payments from LND to a Phoenix wallet fail.
Sending to non-phoenix wallets works.
There is an error when trying to run "lncli queryroutes" command to the Phoenix wallet node id:

[lncli] rpc error: code = Unknown desc = unable to find a path to destination

The LND node can send and receive from other wallets.
Phoenix wallet can send to the LND node successfully.
But I want to fund the Phoenix wallet via the LND node, yet I'm running into these payment failures.

The setup is that I have the LND node with only 1 private channel to a very highly ranked node.

Here are the logs from the LND node for one of these failed payments:

2024-07-27 23:21:49.989 [INF] RPCS: New transaction subscription
2024-07-27 23:21:49.992 [INF] INVC: New invoice subscription client: id=4
2024-07-27 23:21:59.147 [ERR] RPCS: [/routerrpc.Router/EstimateRouteFee]: unable to find a path to destination
2024-07-27 23:22:00.281 [ERR] RPCS: [/routerrpc.Router/EstimateRouteFee]: unable to find a path to destination
2024-07-27 23:22:00.834 [ERR] RPCS: [/routerrpc.Router/EstimateRouteFee]: unable to find a path to destination
2024-07-27 23:22:01.715 [INF] CRTR: Processed channels=16 updates=0 nodes=0 in last 1m0.052705333s
2024-07-27 23:23:01.769 [INF] CRTR: Processed channels=16 updates=0 nodes=0 in last 1m0.053893388s
2024-07-27 23:24:02.610 [INF] CRTR: Processed channels=16 updates=0 nodes=0 in last 1m0.841173965s
2024-07-27 23:24:02.625 [WRN] CRTR: Attempt 2000 for payment REDUCTED failed: TemporaryChannelFailure(update=(*lnwire.ChannelUpdate)(0xc0050a2630)({
 Signature: (lnwire.Sig) {
  bytes: ([64]uint8) (len=64 cap=64) {
   00000000  4a f4 22 16 91 3a 49 39  06 3e 2e 14 65 e7 6e 57  |J."..:I9.>..e.nW|
   00000010  67 7b 9a e4 10 a3 fc 7e  1a a4 93 df 97 2d 85 79  |g{.....~.....-.y|
   00000020  28 66 46 78 b0 0c 8a d0  dd d8 45 f7 3d 64 5a b6  |(fFx......E.=dZ.|
   00000030  9f 24 61 69 d3 92 1c f6  0d 74 dd e2 a6 1f 17 d9  |.$ai.....t......|
  },
  sigType: (lnwire.sigType) 0
 },
 ChainHash: (chainhash.Hash) (len=32 cap=32) REDUCTED,
 ShortChannelID: (lnwire.ShortChannelID) REDUCTED,
 Timestamp: (uint32) 1722058950,
 MessageFlags: (lnwire.ChanUpdateMsgFlags) 00000001,
 ChannelFlags: (lnwire.ChanUpdateChanFlags) 00000000,
 TimeLockDelta: (uint16) 40,
 HtlcMinimumMsat: (lnwire.MilliSatoshi) 1000 mSAT,
 BaseFee: (uint32) 500,
 FeeRate: (uint32) 1000,
 HtlcMaximumMsat: (lnwire.MilliSatoshi) 350000000 mSAT,
 ExtraOpaqueData: (lnwire.ExtraOpaqueData) {
 }
})
)@4
2024-07-27 23:24:02.644 [WRN] CRTR: payment attempt not completed before timeout
2024-07-27 23:24:02.684 [ERR] CRTR: Payment REDUCTED with status=In Flight failed: payment has already failed
2024-07-27 23:24:02.684 [ERR] CRTR: Payment REDUCTED failed: payment has already failed
2024-07-27 23:25:02.646 [INF] CRTR: Processed channels=0 updates=4 nodes=4 in last 1m0.034998889s
2024-07-27 23:25:18.430 [INF] RPCS: Canceling transaction subscription
2024-07-27 23:25:18.430 [ERR] RPCS: [/routerrpc.Router/SubscribeHtlcEvents]: context canceled
2024-07-27 23:25:18.430 [INF] RRPC: Payment stream REDUCTED canceled
2024-07-27 23:25:18.430 [INF] INVC: Cancelling invoice subscription for client=4
2024-07-27 23:26:02.676 [INF] CRTR: Processed channels=7 updates=3 nodes=2 in last 1m0.030799361s

Most of the times I try to send, it's just stuck in a "sending payment" loop. I also tried sending via RTL, getting this error in the logs:

2024-07-28 01:10:03.376 [WRN] CRTR: Attempt 3000 for payment REDUCTED failed: TemporaryChannelFailure(update=(*lnwire.ChannelUpdate)(0xc005d320b0)({
 Signature: (lnwire.Sig) {
  bytes: ([64]uint8) (len=64 cap=64) {
   00000000  2f ef 5f bb 25 f9 a1 bd  e2 6e e2 31 7e d3 95 b7  |/._.%....n.1~...|
   00000010  2a 82 e2 27 6e 42 53 78  5b d2 c8 c2 c9 a8 f4 df  |*..'nBSx[.......|
   00000020  4c a8 30 4c 28 8a 75 cf  49 cc 85 0a 66 8b e4 6c  |L.0L(.u.I...f..l|
   00000030  2f 13 ba 06 14 3a 37 06  0b ff d2 82 56 3d 3e c4  |/....:7.....V=>.|
  },
  sigType: (lnwire.sigType) 0
 },
 ChainHash: (chainhash.Hash) (len=32 cap=32) REDUCTED,
 ShortChannelID: (lnwire.ShortChannelID) REDUCTED,
 Timestamp: (uint32) 1722071277,
 MessageFlags: (lnwire.ChanUpdateMsgFlags) 00000001,
 ChannelFlags: (lnwire.ChanUpdateChanFlags) 00000000,
 TimeLockDelta: (uint16) 40,
 HtlcMinimumMsat: (lnwire.MilliSatoshi) 1000 mSAT,
 BaseFee: (uint32) 0,
 FeeRate: (uint32) 1710,
 HtlcMaximumMsat: (lnwire.MilliSatoshi) 3500000000 mSAT,
 ExtraOpaqueData: (lnwire.ExtraOpaqueData) {
 }
})
)@4
2024-07-28 01:10:03.400 [WRN] CRTR: payment attempt not completed before timeout
2024-07-28 01:10:03.440 [ERR] CRTR: Payment REDUCTED with status=In Flight failed: payment has already failed
2024-07-28 01:10:03.441 [ERR] CRTR: Payment REDUCTED failed: payment has already failed

[guitarchair]

Well it magically works today when I try it (after restarting the LND node). I can't really explain why it wasn't working before.
But I'm still getting the same error for the lncli queryroutes command, even though the payment went through.
I'd still be happy to get an answer to these failures, to make sure it doesn't happen again in the future unexpectedly.

[starius]

Thanks for reporting! Great that it resolved itself! The cause might be an inactive channel. If a channel peer connection drops, the channel goes inactive and is ignored for pathfinding for some time.

[guitarchair]

That's not what happened though. Both my LND and the one I'm connected to are always online. And the Phoenix wallet is online while it's open, as I had it open while doing this.

[starius]

Is the peer of your node connected directly to Phoenix?

[guitarchair]

No. Here is the route of the payment:
First, The big node that my node is connected to, then:
The Conductor
rockshouse
ACINQ
024e..... (My Phoenix wallet id)

[ProofOfKeags]

Can you provide the version of LND you are running?

[guitarchair]

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