Troubleshoot general data source issues

This page provides solutions to common issues that apply across data sources in Grafana. For troubleshooting specific to a data source, refer to the troubleshooting page within each data source’s documentation.

Connection errors

These errors occur when Grafana can’t reach the data source backend.

“Connection refused” or timeout errors

Symptoms:

Save & test fails with a connection error or timeout
Panels show “error” or fail to load data
Intermittent connectivity issues

Possible causes and solutions:

Cause	Solution
Incorrect URL	Verify the data source URL is correct, including the protocol (`http://` or `https://`) and port number.
Network or firewall rules	Ensure the Grafana server can reach the data source endpoint. Check that firewall rules allow outbound traffic on the required port.