Hiya,
I've run into a problem of late (after years of problem free usage), where I'm unable to get into my cpanel or my webmail. When I try to go to www.mydomain.net/cpanel or www.mydomain.net/webmail I get the timed out error after a bit. For the cpanel, the windows security logon never comes up, and for webmail, it never hit's the logon screen. I went to www.mydomain.net, and that part of the site loads, so I'm a bit confused as to what the problem might be.
Any clues?
Are you trying from behind a corporate firewall by chance? If so, they may have updated their rules lately to block the ports cPanel uses.