What do you get if you go to the secure (https) version of the page?

https://www.facebook.com/

it worked....can I do something to make otherthing(http) work??

Thanks for help BTW

Normally, when you connect via http, the browser doesn't check for site identity, so I don't understand what's happening there.

Do you have any security-related add-ons that force popular sites to use a secure connection, or claim to provide anonymous browsing?

Were you making the connection on your own network or on a public network (e.g., school, coffee shop)? If it was a public network, maybe the error indicates that your traffic was being intercepted???

Without hands on, this is a tough one to diagnose.

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

• Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

• Tools > Options > Privacy > Cookies: "Show Cookies"

Also check the cookie exceptions.

@ cor-el: It helped.....thanks a lot

You're welcome