Knowledge Base

How to resolve Python Bolt Driver when executed gives an error "("Failed to establish connection to {!r}".format(address))"

Take the example of Python with the latest Bolt driver 1.2.

Here is the sample code

from neo4j.v1 import GraphDatabase
uri = "bolt://localhost:7687"
driver = GraphDatabase.driver(uri, auth=("neo4j", "Password"))

and when run it gives the following error:

Traceback (most recent call last):
  File "/Users/rk/Documents/Work/Python-Bolt/boltTest.py", line 3, in <module>
    driver = GraphDatabase.driver(uri, auth=("neo4j", "Password"))
  File "/Library/Python/2.7/site-packages/neo4j/v1/api.py", line 112, in driver
    return driver_class(uri, **config)
  File "/Library/Python/2.7/site-packages/neo4j/v1/direct.py", line 56, in __init__
    pool.acquire()
  File "/Library/Python/2.7/site-packages/neo4j/v1/direct.py", line 37, in acquire
    return self.acquire_direct(resolved_addresses[0])
  File "/Library/Python/2.7/site-packages/neo4j/bolt/connection.py", line 386, in acquire_direct
    connection = self.connector(address)
  File "/Library/Python/2.7/site-packages/neo4j/v1/direct.py", line 55, in <lambda>
    pool = DirectConnectionPool(lambda a: connect(a, security_plan.ssl_context, **config), self.address)
  File "/Library/Python/2.7/site-packages/neo4j/bolt/connection.py", line 457, in connect
    raise ServiceUnavailable("Failed to establish connection to {!r}".format(address))
neo4j.exceptions.ServiceUnavailable: Failed to establish connection to ('::1', 7687, 0, 0)

There are two options to resolve this:

  • Either change the localhost to 127.0.0.1 and then run it with the current settings. As shown below:

    from neo4j.v1 import GraphDatabase
uri = "bolt://127.0.0.1:7687"
driver = GraphDatabase.driver(uri, auth=("neo4j", "Password"))

  • Second option is to set the following parameter in conf/neo4j.conf file as shown below:

    dbms.connector.bolt.listen_address=0.0.0.0:7687

    We are defining it to connect from any address (i.e. 0.0.0.0). Restart the database and run the code as:

    from neo4j.v1 import GraphDatabase
uri = "bolt://localhost:7687"
driver = GraphDatabase.driver(uri, auth=("neo4j", "Password"))