[2015-04-19 00:30:49] json_rpc_call failed, retry after 30 seconds
[2015-04-19 00:31:40] HTTP request failed: Failed to connect to zrc.maxminers.ne
t port 3331: Timed out
whas wrong with cpuminer
There's nothing wrong with cpuminer, what's wrong is the pool url you inputted...
https://zrc.maxminers.neT