Hi folks, I just filed an issue https://github.com/haskell/network/issues/447 https://github.com/haskell/network/issues/447 with the network package, I'd like to post here too in seeking your wisedom at the same time. In top-level doc, the minimal example echo server uses Control.Exception.bracket like this: E.bracket (open addr) close loop where resolve = do let hints = defaultHints { addrFlags = [AI_PASSIVE] , addrSocketType = Stream } head <$> getAddrInfo (Just hints) mhost (Just port) open addr = do sock <- socket (addrFamily addr) (addrSocketType addr) (addrProtocol addr) setSocketOption sock ReuseAddr 1 withFdSocket sock setCloseOnExecIfNeeded bind sock $ addrAddress addr listen sock 1024 return sock loop sock = forever $ do (conn, _peer) <- accept sock void $ forkFinally (server conn) (const $ gracefulClose conn 5000) I happened to copy the configuration with another machine's IP address to run on my dev machine, then of course it failed binding to the IP, but in this case I suspect sock above is leaked without close, as open failed at all, so sock is not given to bracket for it to do the cleanup. Is my suspicion correct ? Or I missed something that the example actually won't leak on binding errors ? Best regards, Compl