Hi..Thanks for the reply. As you said I did through rc.local to restore the rule. Thank you very much, now the rules are permanently stored. But still https://facebook
can accessible but when we log in, by default it will try to redirect to http://facebook.com
then the user get access denied. But again if I try https he can log in. And whenever he will click anything after logging in again it will block since it is first redirecting http port but again if the user give https in the same url then the intended link gets open. Although from your help I could avoid little bit for https. But not completely. I tried droping for all of these below ip address
facebook.com has address 18.104.22.168
facebook.com has address 22.214.171.124
facebook.com has address 126.96.36.199
facebook.com has address 188.8.131.52
facebook.com has address 184.108.40.206
facebook.com mail is handled by 10 smtpin.mx.facebook.com.
still https is opening. So please tell me how to block https access for the above ip addresses.