after the server reset, there seems some problems..
some internet shop says they have connection problem too.
in my case, after several nice runs, suddenly get "cant not connect to battle.net" problem.
i do not see checking version screen even.
once it happens, i can not connect anymore with any key, nor any char.
changing ip didnt work.
but i changed router's mac address and ip both, it became to be able to connect again.
after this, going fine.
so you could try to change your mac address, if possible.
some router has such function as pseud mac address, i guess.
i don't know exact english workd tho.