To fix a destination net unreachable error, use the following steps:

1. Check your router or modem to ensure it is powered on, plugged in, and connected correctly.
2. Check your router or modem to confirm that your device is properly configured.
3. Check your network configuration to verify that your device is properly configured.
4. Restart your device to refresh the connection.
5. Check your modem and router settings to make sure that your gateway is configured properly.
6. Run a malware scan to check for any malicious software on your system.
7. Check that the DNS server on your system is properly configured.
8. Check that TCP/IP is properly installed and configured.