From the looks off there new Rules this been posted this can happen or though this is for Tournaments it has some information that might help you out if playing a lot from the same ip.

Am posting this as the UNI my uncle works for got blacklisted late last night blocking all there stunts from access blizzards servers this has come up a today. They where unable to get this fixed as far as I know today and he know I play wow so he needed some help for me to get access to blizzards support. and if I know of any changes they done.


http://us.battle.net/hearthstone/en/...pdate-3-6-2014


Step 2: Get Whitelisted

In order to ensure the safety and security of Battle.net for all players, we have implemented mechanisms to detect and block specific IP addresses if too many connections are being made from a single source. This can occasionally cause problems for organized tournaments where many computers on a local network are all connected to the Internet using the same external IP address. Registering your tournament with Blizzard will allow us to add the IP addresses to the appropriate whitelist for the machines you intend to use for the duration of the tournament. If you’re running an on-site event that will have more than ten (10) people connecting at once from a limited range of IPs, send us an email with the subject Whitelist Request to tourneyinfo [nospam] blizzard.com and include detailed information about your event as well as your venue’s IP information.