py2neo访问neo4j时报timeout

File "/usr/local/python27/lib/python2.7/site-packages/py2neo/cypher/core.py", line 136, in execute
results = tx.commit()
File "/usr/local/python27/lib/python2.7/site-packages/py2neo/cypher/core.py", line 333, in commit
return self.post(self.__commit or self.__begin_commit)
File "/usr/local/python27/lib/python2.7/site-packages/py2neo/cypher/core.py", line 275, in post
rs = resource.post({"statements": self.statements})
File "/usr/local/python27/lib/python2.7/site-packages/py2neo/core.py", line 307, in post
response = self.__base.post(body, headers, **kwargs)
File "/usr/local/python27/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 984, in post
return rq.submit(**kwargs)
File "/usr/local/python27/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/python27/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: timed out

from py2neo.packages.httpstream import http
http.socket_timeout = 9999