First off...

I allow all port 80 to external sites
I allow all port 443 to external sites

Then I have Linkwall lock it all down from there.

I've allowed some specific users to get to Welcome to Facebook! | Facebook and they can get there okay. The rule I'm allowing this to happen with is ** but when they try to login, they're blocked because of:

Port 443 I presume? I'm at a loss. I've put in every combination I can think of. Any ideas?

Other port 443 authenications (eBay for example) work fine.