Hangs when retrieving livereload.js

[rupert-madden-abbott]

I'm unable to connect to Guard using the Chrome browser extension. Upon debugging, it looks like retrieving livereload.js just hangs.

$ ruby -v
ruby 2.3.4p301 (2017-03-30 revision 58214) [x86_64-linux-gnu]
$ guard -v
Guard version 2.14.1

Guardfile

guard 'livereload' do
  watch /.*/
end

Gemfile

gem 'guard'
gem 'guard-livereload'

Starting with debug flag

$ bundle exec guard -d
00:26:09 - DEBUG - Notiffany: gntp not available (Please add "gem 'ruby_gntp'" to your Gemfile and run your app with "bundle exec".).
00:26:09 - DEBUG - Notiffany: growl not available (Unsupported platform "linux-gnu").
00:26:09 - DEBUG - Notiffany: terminal_notifier not available (Unsupported platform "linux-gnu").
00:26:09 - DEBUG - Notiffany: libnotify not available (Please add "gem 'libnotify'" to your Gemfile and run your app with "bundle exec".).
00:26:09 - DEBUG - Command execution: which notify-send
00:26:09 - DEBUG - Notiffany: notifysend not available (libnotify-bin package is not installed).
00:26:09 - DEBUG - Notiffany: notifu not available (Unsupported platform "linux-gnu").
00:26:09 - DEBUG - Command execution: {"ALTERNATE_EDITOR"=>"false"} emacsclient --eval '1'
00:26:09 - DEBUG - Notiffany: emacs not available (Emacs client failed).
00:26:09 - DEBUG - Notiffany: tmux not available (:tmux notifier is only available inside a TMux session.).
00:26:09 - DEBUG - Notiffany: file not available (No :path option given).
00:26:09 - DEBUG - Notiffany is using TerminalTitle to send notifications.
00:26:09 - DEBUG - Command execution: hash stty
00:26:09 - DEBUG - Guard starts all plugins
00:26:09 - DEBUG - Hook :start_begin executed for Guard::LiveReload
00:26:09 - INFO - LiveReload is waiting for a browser to connect.
00:26:09 - DEBUG - Hook :start_end executed for Guard::LiveReload
00:26:09 - INFO - Guard is now watching at '###############'
00:26:09 - DEBUG - Start interactor

Testing with wget

$ wget 127.0.0.1:35729/livereload.js
--2017-06-26 00:27:53--  http://127.0.0.1:35729/livereload.js
Connecting to 127.0.0.1:35729... connected.
HTTP request sent, awaiting response...

and then it just hangs forever.