As someone already posted, a working solution is to use mobile tethering and your phone's 3G connection if you can. Once you get past the launcher you can enter the game, then switch back to your previous connection and play. Worked for me .
If you think I'm going to run right out and buy an iphone so I can long into this game you are out of your $#@$! mind.
correction, this has everything to do with cryptic, they pay cogent to route the game through certain areas.. cryptic constantly tells us cogent is at the route of most of the problems with connection issues, they have been saying it for years.. so it is their problem that they have not fixed the problem (either by making a new arrangement with cogent, or going with another provider)..
It takes a little more effort to switch providers at a business end than at your home. You can't just shop online for those available in your neighborhood and switch with a phone call. Cogent may give them the most cost effective solution they can work with that this time. We are not privy to their financial information so could never venture a guess. Bandwidth is far more expensive then people realize.
Since things are working just fine on Cryptics end and other users can connect, the issue is obviously cogent. Of course Cryptic is the party responsible for communicating and assisting with cogent to restore access to their servers for those who currently are unable to, but that doesn't mean it's their fault for things still being offline.
In any case, I've had bad dealings with cogent and can sympathize with your point that they should switch (if they hit a point where they are capable of doing so). The website I work on switched to Amazon's web services and haven't looked back. Maybe it's something they are currently looking into (or should).