Dal's been working fine for me and there have been other people around, so it's definitely a local problem. Are you getting any error messages?

I second the above anon's suggestions about trying a different login IP and putting in a help ticket. I'd also recommend doing a full virus scan on your regular machine, if you don't do those regularly; Dal automatically bans logins from machines that have have been infected by certain malware. That happened to me a while back - I got rid of the malware and after a few days could log into Dal again when the ban lapsed automatically.