[Ethereum] Deploying contracts on geth returns Error: connect ECONNREFUSED 127.0.0.1:8545

personal.unlockAccount does not take a file path, it takes a password. See: https://github.com/ethereum/go-ethereum/wiki/JavaScript-Console#personalunlockaccount

On the command line, try using this:

geth --unlock 0 --password "fullpathtofile" - the unlock argument takes an index. You can see the indexes by running geth account list.

If you want to make sure that it's not a problem with the file, you can also do this:

geth --unlock 0 --password <(echo "PASSWORD_HERE")

The <(command) form executes the command inside the parenthesis and creates a named pipe that it passes to the program, acting as a file with the contents of that output. You can use this as a test for non-sensitive test accounts.

The problem was in the truffle.js file.

module.exports = {
  networks: {
    rinkeby: {
      network_id: 4,
      host: '127.0.0.1',
      port: 8545,
      gas: 4000000,
      from: <your account address>
    },
  },
  rpc: {
    // Use the default host and port when not using rinkeby
    host: 'localhost',
    port: 8080,
  },
};

Just needed to add a from: <account address> into rinkeby's config information.