Issue started after installing cpp-ethereum & updating geth to 1.3.3. Geth continually re-opens in the background after being forced to shut down. When I try and run geth in terminal, I receive the following error:

Fatal: Error starting Ethereum: listen udp :30303: bind: address already >in use (possibly another instance of geth is using the same port)

Tried a hard re-start, after which geth re-opened in the background again. Tried uninstalling cpp-ethereum and uninstalling geth (both 1.3.3 and the previous 1.2.2). As soon as it is reinstalled, geth opens up in the background.

Open to any and all suggestions!

  • How are you installing Geth?
    – Maran
    Feb 3, 2016 at 13:44
  • using brew, e.g. ---- '==> Installing ethereum from ethereum/ethereum ==> Downloading build.ethdev.com/builds/bottles/ethereum-1.3.3.yosemite. Already downloaded: /Library/Caches/Homebrew/ethereum-1.3.3.yosemite.bottle.8.tar.gz ==> Pouring ethereum-1.3.3.yosemite.bottle.8.tar.gz ==> Caveats To reload ethereum/ethereum/ethereum after an upgrade: launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.ethereum.plist launchctl load ~/Library/LaunchAgents/homebrew.mxcl.ethereum.plist ==> Summary 🍺 /usr/local/Cellar/ethereum/1.3.3: 18 files, 87.0M'
    – Josh Stark
    Feb 3, 2016 at 17:05
  • 1
    launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.ethereum.plist should hopefully prevent geth from booting on restart. Could you try that?
    – Maran
    Feb 3, 2016 at 17:12

1 Answer 1


When you install geth via the brew package it sets up an automatic launch script so Geth launches during boot.

If this is not desirable you can disable it using:

launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.ethereum.plist

If this does not do the trick, then open the homebrew.mxcl.ethereum.plist file (for example in Xcode) and change the Boolean values of RunAtLoad and KeepAlive from 'true' to 'false'.

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