# Troubleshooting a Remote Server Returned An Error on NextSeq 500/550 The following error can occur at the start or during a run but will not cause the run to stop. "Remote server returned an error: (426) Connection closed; transfer aborted" ![](https://761066130-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGM9W2DuBTgEXv1ClCm8H%2Fuploads%2Fgit-blob-e531ce7aa830ab64d37a5203eb51ff12fe11f445%2Fimage1.jpg?alt=media\&token=246cc5f5-b9c5-4e16-b089-b41fc9ba365c) This error is suspected to be caused by a temporary interruption in the network. Data transfer is expected to be resumed as soon as connection is restored. **Troubleshooting steps:** * If run has not stopped, allow instrument to proceed with sequencing and confirm all files are transferred successfully to the output location. * If files were not transferred successfully to the output location, contact [Illumina Technical Support](https://www.illumina.com/company/contact-us.html#/united-states/technical-support) for further assistance. \ \ \
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