title: Python py2neo SocketError: Connection Refused
body: <p>I'm trying to follow along to <a href="http://nicolewhite.github.io/neo4j-jupyter/hello-world.html" rel="nofollow">this</a> neo4j tutorial and I'm having a problem connecting to the API. Here's my traceback:</p>
  
  <pre><code>&gt;&gt;&gt; graph.delete_all()
  
  Traceback (most recent call last):
  File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  File "/usr/local/lib/python2.7/site-packages/py2neo/core.py", line 748,    in     delete_all
   statement = StartOrMatch(self).relationship("r", "*").string + "DELETE r"
   File "/usr/local/lib/python2.7/site-packages/py2neo/cypher/util.py", line 45, in string
  if self.graph.supports_start_clause:
  File "/usr/local/lib/python2.7/site-packages/py2neo/core.py", line 1105, in    supports_start_clause
  return self.neo4j_version &lt; (2, 2)
   File "/usr/local/lib/python2.7/site-packages/py2neo/core.py", line 964, in    neo4j_version
  return version_tuple(self.resource.metadata["neo4j_version"])
  File "/usr/local/lib/python2.7/site-packages/py2neo/core.py", line 213, in metadata
  self.get()
  File "/usr/local/lib/python2.7/site-packages/py2neo/core.py", line 258, in get
  response = self.__base.get(headers=headers, redirect_limit=redirect_limit,   **kwargs)
  File "/usr/local/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 966, in get
  return self.__get_or_head("GET", if_modified_since, headers, redirect_limit, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 943, in __get_or_head
  return rq.submit(redirect_limit=redirect_limit, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 433, in submit
  http, rs = submit(self.method, uri, self.body, self.headers)
  File "/usr/local/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 362, in submit
  raise SocketError(code, description, host_port=uri.host_port)
  py2neo.packages.httpstream.http.SocketError: Connection refused
  </code></pre>
  
  <p>I'm new to networking/socket connections, so a human-readable explanation of what's going on would be very helpful.</p>