I'm receiving this error as well. I moved my PC from spare room to bedroom and now I can't login. I am on a wireless network. with all the server maintenance last week I have played for a grand total of 3 hours in 7 days.
Any suggestions to fix? This will be my last attempt before deleting this game forever. I haven't even reach lvl 60 with ONE character!
So I startup, get to login screen, enter my password and click login. Then the server authentication screen pops up, and it doesn't go past the first "tick", and I get the message "Cannot connect with the battlenet server. Please check the [Server Status] page and ensure you are currently connected to the internet. (error 3003)".
I am currently connected to the internet, and have not changed any settings since I started playing Diablo. So is something wrong with my computer or yours? Please help D:
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