The port numbers used in the ZMQ examples are inconsistent between:
- The initial explanation of ZMQ
```
They must be combined in the same ZMQ socket
address (e.g. `--zmqpubrawblock=tcp://127.0.0.1:28332` and
`--zmqpubrawtx=tcp://127.0.0.1:28332`).
```
- The sample bitcoin.conf
```
zmqpubrawblock=tcp://127.0.0.1:18501
zmqpubrawtx=tcp://127.0.0.1:18501
```
- The lnd command-line example:
```
lnd --bitcoin.active --bitcoin.testnet --debuglevel=debug --bitcoin.node=bitcoind --bitcoind.rpcuser=REPLACEME --bitcoind.rpcpass=REPLACEME --bitcoind.zmqpath=tcp://127.0.0.1:28332 --externalip=X.X.X.X
```
I changed the sample bitcoin.conf port numbers to 28332 so they match the rest of the examples.