# Trying to access storage
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Learn about the troubleshooting tips for trying to access storage.

## Using an external Amazon FSx for Lustre file system
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Make sure that traffic is allowed between the cluster and file system. The file system must be associated with a security group that allows inbound and outbound TCP traffic through ports 988, 1021, 1022, and 1023. For more information about how to set up security groups, see [FileSystemId](SharedStorage-v3.md#yaml-SharedStorage-FsxLustreSettings-FileSystemId).

## Using an external Amazon Elastic File System file system
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Make sure that traffic is allowed between the cluster and file system. The file system must be associated with a security group that allows inbound and outbound TCP traffic through ports 988, 1021, 1022, and 1023. For more information about how to set up security groups, see [FileSystemId](SharedStorage-v3.md#yaml-SharedStorage-EfsSettings-FileSystemId).