---
title: "Test the connection | Grafana Labs"
description: "Save and test your Elasticsearch data source connection to verify Grafana can reach your instance."
---

> For a curated documentation index, see [llms.txt](/llms.txt). For the complete documentation index, see [llms-full.txt](/llms-full.txt).

# Test the connection

Now that you’ve configured the connection details, save the data source and verify that Grafana can successfully connect to your Elasticsearch instance.

1. Click **Save & test**.
   
   A successful connection displays the message: `Elasticsearch data source is healthy.`

### Common connection issues

Expand table

| Symptom            | Likely cause                                 | Solution                                                                                                         |
|--------------------|----------------------------------------------|------------------------------------------------------------------------------------------------------------------|
| Connection refused | Elasticsearch not running or wrong URL       | Verify the URL and port (default `9200`) and that Elasticsearch is accepting connections                         |
| Unauthorized (401) | Invalid credentials or API key               | Verify the username and password, or regenerate the API key with read access                                     |
| Forbidden (403)    | Missing cluster privileges                   | Grant the `monitor`, `view_index_metadata`, and `read` privileges to the user or API key                         |
| No index found     | Incorrect index name or pattern              | Verify the index name and, if you use a time pattern, that matching indices exist                                |
| Timeout            | Grafana Cloud can’t reach a private instance | Set up [Private data source connect](/docs/grafana-cloud/connect-externally-hosted/private-data-source-connect/) |

In the next milestone, you’ll run a query and explore your Elasticsearch data in Grafana.

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