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

# Troubleshoot data issues

These are some quick tips to troubleshoot issues with data in Domino.

## Check the network connection

Ensure that there is a clear route between Domino and the external data store. Confirm that firewall access rules allow traffic between the Domino deployment and the data store.

In the case of a [Domino Nexus hybrid deployment](/cloud/admin/architecture-and-deployment/architecture/nexus-hybrid-architecture), check that there is a clear route between the Domino control plane and the [data plane](/cloud/admin/platform-configuration/manage-data-planes).

## Check which Data Planes have access to the data

In a [Domino Nexus hybrid deployment](/cloud/admin/architecture-and-deployment/architecture/nexus-hybrid-architecture), different data stores are available on different [data planes](/cloud/admin/platform-configuration/manage-data-planes).

Some features are only support data available in the `Local` data plane (hosted in the control plane):

* Domino endpoints

* Apps

* Starburst-powered data sources

Other types of data sources can be accessed on both the `Local` and remote data planes, but functionality on remote data planes is in Preview.

EDVs are the primary method for accessing large data sets in Domino Nexus; they have a first-class notion of data locality.