Could not connect to server (Name resolution failure)

[rex4539]

Describe the bug
Zap Mobile cannot connect to server.

To Reproduce
Steps to reproduce the behavior:

1. Start Node Launcher.
2. Start Zap Mobile on iPhone.
3. On Terminal: lndconnect -j
4. Paste output on iPhone.

Expected behavior
Zap mobile connects to server.

What happened
Error message "Could not connect to server (Name resolution failure)"

Your environment

• Device: iPhone7
• OS: iOS 13.1

Additional context
Zap Desktop connects to server perfectly.

[rex4539]

@JimmyMow

[JimmyMow]

Hey @rex4539

Are you on the same local network? Are you port forwarding and sure your node is accessible?

Also, if I recall correctly, the Node Launcher has a Open Zap button or something of the like?

[rex4539]

If it wasn't clear from the bug report, my Zap Desktop connects fine. The mobile one on iOS is failing.

[JimmyMow]

Hmmm, interesting. What Zap iOS release/version are you using @rex4539?

[rex4539]

Hm, after reading the docs, perhaps I'm having wrong expectations.

My expectation was to connect to my local lnd node on my Mac. I do not run a docker or other kind of remote node.

Is there a way to connect to my local node running on my Mac?

[JimmyMow]

Ahhhh, this explains a lot.

It is possible, but not trivial. If you created a wallet within Zap Desktop, then by default you won't be able to. We don't set up the local LND to accept any inbound connections and don't allow outside apps to connect to it for various reasons. However, if you want to, or if you set up LND on your own, you can connect to it given the correct setup.

How did you setup LND locally?

[rex4539]

lnd was automatically set up by Node Launcher and Zap Desktop automatically connected to my lnd node. I did not have to configure anything.

[rex4539]

My lnd.conf

# Auto-Generated Configuration File
# Node Launcher version 6.0.6
debuglevel=info
restlisten=127.0.0.1:8081
rpclisten=127.0.0.1:10009
tlsextraip=127.0.0.1
color=#000000
listen=127.0.0.1:9735
bitcoin.active=1
bitcoin.node=bitcoind
bitcoind.rpchost=127.0.0.1:8332
bitcoind.rpcuser=default_user
bitcoind.rpcpass=mysupersecretpassword
bitcoind.zmqpubrawblock=tcp://127.0.0.1:18500
bitcoind.zmqpubrawtx=tcp://127.0.0.1:18501

[JimmyMow]

Ok, so this configuration makes the node accessible on your local network. Is your phone on the same network?

If you'd like to join our slack, it might be easier to debug this there