Suddenly today, my raspberry pi adblocker setup stopped working. I did the `ssh <ip_address>` to the raspberry-pi. I noticed the following message:

Wi-Fi is currently blocked by rfkill.

Use raspi-config to set the country before use.

Also I noticed that date and time were way off when I executed command "date" on terminal.

Fix:

To set the correct date at time, execute command : `sudo date -s "12/11/2021 10:1" `

Also, run `sudo raspi-config` and set the wifi country code by going to "Localisation Options > WLAN Country" and select your country code from the list.

Reboot the raspberry-pi, it came back up working as expected.