Folks, saying, "I can't login" is not going to help your situation. Please be very detailed about exactly what messages you are getting, where in the process you are getting a failure and so on.
99% of all login problems are attributable to software firewalls. When in doubt, shutdown your firewall (i.e. kill the process, do not simply "disable" it) and see if you get in. If you do, then you know where the issue is.