1. Open the configuration file located at /etc/grafana/grafana.ini and navigate to the [dataproxy] section. Increase the timeout setting to 360 (which equals 360 seconds).

2. Restart the Grafana server by running the command:

   systemctl restart grafana-server

3. In the Grafana UI, go to the Data Sources section, select the Loki data source, and update the timeout setting to 360 (360 seconds).

Following these steps should resolve the error you encountered.