> For the complete documentation index, see [llms.txt](https://knowledge.illumina.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledge.illumina.com/instrumentation/miseq/instrumentation-miseq-troubleshooting-list/000003754.md).

# Troubleshooting Network Connection Active errors during Pre run Checks on MiSeq

Users may encounter a "Network Connection Active" error during the Pre-Run Checks after starting a sequencing run. This is typically either an issue with the network connection to the instrument or a communication error on the instrument.

**To troubleshoot**:

1. Ensure that the network cable is correctly plugged into the instrument.
2. If Network connection is not restored after removing and re-inserting the network cable, select **Reboot** on the **Manage Instrument** screen within the MiSeq Control Software\
   to reboot the instrument.
3. If the connection is still not restored, select **Shut Down** from the **Manage Instrument** screen, and then turn off the instrument using the power switch. Wait at least 60 seconds, and then turn on the instrument and start the software.

If a full power cycle does not resolve this error, contact [Illumina Technical Support](https://www.illumina.com/company/contact-us.html#/united-states/technical-support).

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #3754), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000003754%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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