No problem here. Perhaps you should elaborate on the problem you are having if you would like some suggestions for fixing the problem. Given the information from your post the only advice I have is to disable the firewall and try to log in. If it works then log out, enable the firewall and restore the default settings. Try to log in again.
No problems here, but I have had problems with other internet shopping sites. Disabling the firewall has always worked for me in those cases, but as you found out, it can be dangerous.