ConnectionUnavailable: Cannot open connection to ConnectionProfile('bolt://

[pwrose_ucsd]

I'm trying to connect to a Neo4j instance using py2neo in a Jupyter Notebook running on Mybinder.org. See the example here:
Binder

I'll get the following error:

ConnectionUnavailable: Cannot open connection to ConnectionProfile('bolt://...')

What causes this problem and how can I work around it?

[michael_hunger]

Any more error info?

What kind of URL and server do you have?
Which py2neo version, which neo4j version.
Does it work in a regular python shell with py2neo?

etc.

[pwrose_ucsd]

Neo4j server:
Operating System: CentOS Linux 8 (Core)

Neo4j: Enterprise 4.1.1

py2neo: 2020.1.1

Our Neo4j instance is publicly accessible (see https://github.com/covid-19-net/covid-19-community for details) here:
http://132.249.238.185:7474/browser/ (username: reader, password: demo)

An example Jupyter Notebook is here:
https://github.com/covid-19-net/covid-19-community/blob/master/notebooks/analyses/GraphVisualization...

You can run this notebook on MyBinder.org to reproduce the error:
https://mybinder.org/v2/gh/covid-19-net/covid-19-community/HEAD?filepath=notebooks%2Fanalyses%2FGrap...

The same notebook works fine when run locally or on the Pangeo server:
https://binder.pangeo.io/v2/gh/covid-19-net/covid-19-community/master?filepath=notebooks%2Fanalyses%...

[michael_hunger]

Could it be incompatible python version or network visibility?

I.e. can you reach the neo4j server from your mybinder instance? perhaps they block ports outside of http(s) range?

[pwrose_ucsd]

Yes, thanks, it must be a blocked port.

[parthiv3215]

Im facing the same error. How do i resolve it