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To fix an unanticipated Linksys error 2123, use these methods. Before continuing, check to see if your Linksys router is on and linked to the internet. The router can then be reset by being disconnected, taking ten to twenty seconds, and then plugged back in. Check to determine if that network model contains any available firmware updates if the issue persists. From the Linksys website, get the most recent firmware for your specific router model. Follow Linksys’ instructions to update the firmware. Reset the router to its factory settings as well. Find the reset button on your router, which is typically located on the bottom or rear, then push and hold it there until the router's lights begin to flicker, around 10 seconds. Reset your network settings and verify that Linksys error 2123 has been fixed after the router has rebooted. It is advised to get in touch with Linksys support if the problem continues for more help.