> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hellocobi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Troubleshooting

> Diagnose and fix common Data Connector issues

## Connection Failed

If your connection test fails, work through the following checks:

1. **Firewall rules.** Make sure Cobi's IP addresses are allowlisted.
2. **Credentials.** Double-check your username and password are correct.
3. **Host and port.** Confirm the host address and port match your database configuration.
4. **Database name.** Check that the database exists and the user has been granted access to it.
5. **SSL requirements.** Some databases require SSL connections.
6. **MongoDB only.** Ensure outbound HTTPS access is permitted from your server. Contact [support@hellocobi.com](mailto:support@hellocobi.com) for on-premises or air-gapped deployments.

## Slow Queries

If the Data Assistant is slow when querying your database:

1. Ensure your database has appropriate indexes on the columns being queried.
2. Consider creating views for commonly queried data.
3. Add [Custom Instructions](/platform/custom-instructions) to help Cobi write more targeted queries.