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No Communication Between Modem and Computer
Confirm your device is connected to your modem, otherwise it will not be able to access the modem's default gateway. Note: WiFi devices connected via WPS or Guest WiFi (an optional feature in some modems) are not able to access the modem's default gateway. You must connect using the WiFi password.
Turn off both your device and your modem and leave them off for at least 60 seconds.
Turn your device and modem back on and allow them both to reboot.
If some devices can access your modem's default gateway but others can't, the devices that can't may be faulty. If you suspect this is the case, you may need to make a claim for a replacement under warranty or if the warranty has expired, investigate the possibility of getting it repaired.
Windows users only: performing a winsock reset may resolve an issue with a wireless adapter.