CIS doesn’t detects External LAN Card. I mean I installed CIS with Comodo DNS server enabled but CIS enabled the DNS server on inbuilt LAN Card which is damaged & so I have disabled it. Comodo didn’t enabled the DNS server on the right LAN card i.e External LAN card which is enabled & in use. Just thought to mention here. I know to change the DNS manually. By the way any strings to check DNS working or not i.e to see the blocked page.
Edit - If I use Comodo DNS I always get low or limited connectivity icon. Tried many times but still the prob. My ISP setting is obtain DNS auto, DHCP disabled.