Tenda W300D User Manual page 128

Now the direct link between your computer and the router has been
successfully established, which means you can log on to the router's
web-based utility.
2. If the screen shows as below, it indicates the connection hasn't
been established. Then please check the previous settings, the
power of the Router, and the cables between the Router and the
computer. Then try to set it again.
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ADSL2/2+ Router