I have found something weird. Below is the steps i tried.
- I have clear the Browser Cache, and flush the DNS.
I have ensure that the browser not able to get the other website only whitelist. and Windows Update also Shows error connection to update service.
- I remain the same as Using Service-Web Filter -> Site Blocking with (ENABLE (tick) , Mode WhiteList , Host Name Enable : www.youtube.com) .
- The Next step , i restart the Modem Teltonika RUT 950.
-> After Restart the Modem, It seems that the Modem allows all the DNS resolved during first few minutes and pass to the computer . At this point onwards, The computer able to browse to website as they like without restriction of Site Blocking Setting.
( This works for Ping command also) If i am ping the address during the moment , then I can continue to browse to those website from now on. Then it works until i FlushDNS. Then The ping will not work for the website not in the whitelist.
Maybe you have a look into this ? Thank you very much for your support