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1] Set DNS Server Manually
2] Manually Set Your MAC Address
3] Disable Antivirus and Firewall in PC
4] Re-install Network Drivers if DNS Server isn’t Responding
5] Update Router’s Firmware
6] Use netsh Command
7] Restart Your Modem
8] Run PC in Safe Mode
9] Disable MS Virtual WiFi Miniport Adapter
10] Disable all Additional Connections
11] Turn off Peer-to-Peer Update Feature
12] Wait for ISP to Fix DNS Server not Responding Error

These are 12 Solutions to Fix DNS Server Not Responding Error
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