Getting Error: "Failed to obtain connection towards 'READ' server." When attempting to connect to neo4j database using Neo4jGraph langchain integration

[AsmaaMHadir]

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Example Code

from langchain_community.graphs import Neo4jGraph

OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
NEO4J_URL = os.getenv("NEO4J_URL")
NEO4J_USERNAME = os.getenv("NEO4J_USERNAME")
NEO4J_PASSWORD = os.getenv("NEO4J_PASSWORD")


graph = Neo4jGraph(
        url=NEO4J_URL, username=NEO4J_USERNAME, password=NEO4J_PASSWORD
        )

Description

I am using Neo4JGraph integration to connect to my database but I keep getting this error: Failed to obtain connection towards 'READ' server. What is the issue here? I am able to successfully connect to the database on Neo4j desktop as well as on the browser so I doubt its a credentials issue. Please help.

System Info

langchain==0.1.9
langchain-community==0.0.22
langchain-core==0.1.26
langchain-experimental==0.0.50
langchain-openai==0.0.5
langchainhub==0.1.14
python==3.10.12

[dosubot[bot]]

🤖

Hey @AsmaaMHadir, great to see you diving into another challenge! Hope all's been well since our last chat.

The error message "Failed to obtain connection towards 'READ' server" typically indicates that the Neo4j driver is unable to establish a connection with the Neo4j database. This could be due to a variety of reasons such as network issues, incorrect configuration, or the database server being down.

Given that you're able to connect to the database through other means, it's less likely to be a network issue or the server being down. However, it's still possible that there's a configuration issue that's specific to the way the Neo4jGraph class is trying to connect to the database.

Here are a few things you can check:

1. Incorrect URL: The URL provided might be incorrect or not reachable from the application. The URL is fetched from the environment variable NEO4J_URL or from the url parameter of the Neo4jGraph constructor.

2. Incorrect Credentials: The username or password provided might be incorrect. These are fetched from the environment variables NEO4J_USERNAME and NEO4J_PASSWORD or from the username and password parameters of the Neo4jGraph constructor.

3. Network Issues: There might be network issues preventing the application from reaching the Neo4j server.

4. Server Down: The Neo4j server might be down or not accepting connections.

You can debug this issue by checking the above points. Make sure the URL and credentials are correct and the server is reachable and accepting connections. If the issue persists, you might want to check the logs of the Neo4j server for any errors or warnings.

If you're still having trouble after checking these things, it would be helpful to have a bit more information. Could you provide the full stack trace of the error you're seeing? That might give us some more clues about what's going wrong.

Sources

• libs/community/langchain_community/chat_message_histories/neo4j.py
• libs/community/langchain_community/graphs/neo4j_graph.py

About Dosu

This response is meant to be useful and save you time. It is not meant to be a precise solution, but rather a starting point for your own research.

Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant.

If you want to continue the conversation, start your reply with @dosu-bot.

[AsmaaMHadir]

@dosu I am using neo4j version 5.14.1

[dosubot[bot]]

🤖

It looks like you're using Neo4j, a graph database management system. How can I assist you with Neo4j today?

About Dosu

This response is meant to be useful and save you time. It is not meant to be a precise solution, but rather a starting point for your own research.

Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant.

If you want to continue the conversation, start your reply with @dosu-bot.

[jalakoo]

Hi @AsmaaMHadir,

What virtual environment (if any) are you using (pipenv, poetry, etc)?

Have you already tried using the latest Neo4j version (5.18)?

And have you tried connecting to a local running Neo4j database to test?

[deepraj21]

@dosu I am using neo4j version 5.14.1

are you able to fix the issue or find a solution?
we are facing the same issue

[hasan-at-reqcon]

I am experiencing the same issue