Hi You can do a couple of things to solve that issue. You can check the optical device cable. it may be a driver issue you can upgrade your optical device's driver. or you can buy a new cable. https://www.allhdd.com/computer-cables/optical-cable/50-meter/sfp-25g-aoc7m-cisco-new-sealed/ Or you can also try to change your optical device or buy a new one. _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure