# Seeing nodes are in `DOWN` state with `Reason (Code:InsufficientInstanceCapacity)...`
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You are experiencing an insufficient capacity issue. Follow [https://aws.amazon.com/premiumsupport/knowledge-center/ec2-insufficient-capacity-errors/](https://aws.amazon.com/premiumsupport/knowledge-center/ec2-insufficient-capacity-errors/) to troubleshoot the issue. For more information about AWS ParallelCluster's fast insufficient capacity fail-over mode, see [Slurm cluster fast insufficient capacity fail-over](slurm-short-capacity-fail-mode-v3.md).