Before using d-link, even new, it is better to do 30+30+30 rezet — turning on the power, wait a minute, to boot, hold reset, after 30 seconds pull out the food, another 30 to be inserted back in another 30 over-the-counter reset.
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Treated thus arose a couple of times spontaneously jambs-functioning of the internal DNS, on other issues as well can help.