Using Neptune with LangChain

Question

Hello,
I am trying to use the NeptuneGraph integration provided by Langchain on [Link to Docs](https://python.langchain.com/v0.2/docs/integrations/graphs/amazon_neptune_open_cypher/)

```python

from langchain_community.graphs import NeptuneGraph

host = ""

port = 8182

use_https = True

graph = NeptuneGraph(host=host, port=port, use_https=use_https)

```

I try passing the endpoint as host, but everytime the response is a timeout error. There isn't enough explanation on langchain's docs regarding what the issue might be also what am i actually supposed to pass as host in above code ???

Thanks,
Nithin

Akira · Answer

I think the problem lies in the authentication process to Neptune.
If you do not specify a `client` or `credentials_profile_name`, NeptuneGraph will execute boto3.Session() internally. 
I suspect that the correct credentials are not being read at this time, and that the connection to Neptune is not being made.

https://api.python.langchain.com/en/latest/graphs/langchain_community.graphs.neptune_graph.NeptuneGraph.html#langchain_community.graphs.neptune_graph.NeptuneGraph

If you are running on a local PC and have not set up your credentials, try the following.

https://boto3.amazonaws.com/v1/documentation/api/latest/guide/credentials.html

Using Neptune with LangChain

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