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What do the status lights mean on my Linksys WRT1900AC and WRT1200AC?

This article will show you the meaning of the different status lights on your Linksys WRT1900AC AC1900 Dual-Band WiFi Router and Linksys WRT1200AC AC1200 Dual-Band WiFi Router.
 
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Things to remember:
  • The Wi-Fi lights will only turn ON when there are clients connected to either your 2.4 GHz or 5 GHz radio band on the router.
  • The 1-4 lights will only turn ON when you have a client physically connected with an ethernet cable at the back of router ports labeled 1-4.
  • The WPS lights will only turn ON when you activate the Wi-Fi Protected Setup™ (WPS) button at the back of the router or through the web interface.
  • The eSATA, USB 1, and USB 2 lights will only turn ON when you have a hard drive connected to the router using the USB 1 / USB 2 ports at the back.
 
Front panel

 
LightColorActivityDescription
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Power
WhiteSolid whiteThe router is powered ON.
Blinking whiteThe router goes through its self-diagnostic mode during boot up.
User-added image InternetWhite / OrangeSolid whiteThe router is connected to the internet.
Blinking whiteThe router works to establish a connection.
Solid orangeThe connection is down due to configuration issues.
Blinking orangeThe internet connection is down due to physical connection issues.
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2.4 GHz
WhiteSolid whiteOne or more clients are connected to the 2.4 GHz network.
Blinking whiteThe router is sending or receiving data over the 2.4 GHz network.
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5 GHz
WhiteSolid whiteOne or more clients are connected to the 5 GHz network.
Blinking whiteThe router is sending or receiving data over the 5 GHz network.
User-added image eSATAWhiteOFFNo eSATA device is connected or a USB device is connected instead.
Solid whiteAn eSATA device is connected.
Blinking whiteIt indicates activity through the eSATA port.
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USB 1
WhiteOFFNo USB is connected or an eSATA device is connected instead.
Solid whiteA USB device is connected.
Blinking whiteIt indicates activity on the port.
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USB 2 Primary
WhiteOFFNo USB 3.0 is connected.
Solid whiteA USB device is connected.
Blinking whiteIt indicates activity on the port.
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USB 2 Secondary
White (dot shape)OFFA USB 1.0 or USB 2.0 device is connected.
Solid whiteA USB 3.0 device is connected.
User-added imageETHERNET 1 thru 4 PrimaryWhite (T-shape)Solid whiteThese numbered lights correspond with the numbered ports on the router’s back panel.  If the white light (T shape) is solid, the router is connected to a device through that port number.
Flashing whiteIt indicates network activity over that port.
User-added imageETHERNET 1 thru 4 SecondaryWhite (dot shape)OFFThe router is successfully connected to a device through that port at 10/100 Mbps.
Solid whiteThe router is successfully connected to a device at 1000 Mbps.
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Wi-Fi Protected Setup (WPS)
White / Orange When you press the WPS button on the back of the router (blue button) or from the web interface, the WPS light will blink slowly for 2 minutes.  It will be solid white for 5 seconds to indicate a successful connection.  The light blinks orange if the WPS process fails.  Make sure the client device supports WPS.  Wait until the light is OFF, and then try again.  The router supports one session at a time.

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