# Manually stopping and restarting Universal Copy Service (UCS) on the NextSeq 1000/2000
Universal Copy Service (UCS) is the service on the NextSeq 1000/2000 that transfers data from the instrument to BaseSpace Sequence Hub. If the service is not functioning properly, it may need to be restarted.
Power cycling is the preferred method to restart Universal Copy Service (UCS); however, some troubleshooting will require manually stopping and restarting UCS with the steps below.
1. Close the NextSeq Control Software
2. Launch the terminal window by navigating to Applications > System Tools > Terminal
3. If currently logged in as 'ilmnuser' use the command `su ilmnadmin` to switch to the 'ilmnadmin' account within the terminal.
4. Stop UCS using the command sudo systemctl stop universal-copy-service.service
* After entering the command enter the ilmnadmin password when prompted.
5. Confirm that UCS is stopped using the command sudo systemctl status universal-copy-service.service
* The status will display as Active: inactive(dead) if service has stopped
* 
6. Start UCS using the command sudo systemctl start universal-copy-service.service
* Status for started UCS will display as Active: active (running)
* 
7. Launch the control software if needed for the current path of troubleshooting.
For more information, search for Knowledge Base Articles:
* **Tips and Tricks for Navigating the Linux Environment on the NextSeq 1000/2000.**
* **How to Manually Start and Stop Universal Copy Service (UCS) on NextSeq 1000/2000.**
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| *For any feedback or questions regarding this article (Illumina Knowledge Article #3515), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000003515%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |
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