XXBTZUSD is the pair notation you looking for.
Heartbeat is a general connectivity error. I think these days it has a lot to do with Kraks slow servers. For the pas 3 days I have almost been unable to access my account there. And even when in, every other function seems to working only sporadically. This morning I had a successful deposit, but it didn't show on my general screen for several hours. The notification email was late also.
So, if everything is OK on your side (correct gunthy IP, open firewall on ports 5000, 5001 and maybe 3000) then it's Kraken again. There seems to be some run on Kraken, but can't figure out on what ...
If I knew how to make good buys and sales, I wouldn't be here trying to help rookies, so this one is up to you, and good luck on that.
