Are you using a WC3 client or with a bot? If the latter, make sure you are using the latest IPs. europe.battle.net, should, in theory, work, but if not you can try 213.248.115.11.
If you are trying to connect with the former, I'm not sure. It could be possible, maybe, that you are IP banned or CD-Key banned. You can confirm this by trying to use a bot.