I canot open the facebook

Hi,

Go to your computer firewall and see if the firewall is on. If on, then check the tickbox which says alow programs listed in the programs that the firewall allows to pass through.

if this doesnt solve it, try to disable your firewall and access your facebook account, if you can access it then you just needs to configure your firewall correctly. Note: Enable your firewall after you test it to prevent malware. If still cannot access after you disable the firewall, Please check if you are using other software firewalls and configure it.