Fresh install but will not restart

Installation
1

Dear folks,

Just installed HA on my Mac (iMac) for testing and fiddling. Worked fine out of the box (sort of) but now I’m having trouble restarting HA. I get this error when i run hass --open-ui:

    16-11-02 21:54:13 INFO (Thread-6) [netdisco.service] Scanning
Exception in thread WSGI-server:
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "/Users/tomerik/.homeassistant/deps/cherrypy/wsgiserver/__init__.py", line 2008, in start
    raise socket.error(msg)
OSError: No socket could be created -- (('0.0.0.0', 8123): [Errno 48] Address already in use)

Any clues on what’s wrong?

2

Is there already a running Home Assistant instance or one that wasn’t killed properly?

3

That might be the case. How can I find that out?

4

Search for hass by listing the running processes. I guess that this works on macOS too.