An ASUS router blinking blue light usually means that it is either in the process of connecting or is operating in a certain mode
A blue blinking light may indicate several things depending on the model and how it behaves.
A flickering blue light on many ASUS routers indicates that the device is trying to connect to the internet.
For instance the blue light on the router could flicker while it establishes a connection with your Internet service provider (ISP) after restarting or turning it on.
Once a firm connection is made this phase which often lasts a few seconds should come to an end.
At that point the light should become solid blue or green to indicate that everything is normal.
If the internet isn't functioning and the blue light is blinking continuously there could be a problem with the connection.
To make sure there are no service interruptions in this situation you can try resetting your modem and router, inspecting all of your cable connections or getting in touch with your ISP.
It might also be helpful to confirm your router settings using the 192.168.1.1 admin interface in order to find any setup problems.
A blue light that blinks on some ASUS models may also be an indication that WPS (Wi-Fi Protected Setup) mode is active which means the router is attempting to establish a secure WPS pairing connection with a device.
If inadvertent this may be disabled by restarting the router or explicitly quitting WPS mode.
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