IT'S WORKING!! jeje thanks folks, i have my little machine working, something was blocking the communication between proxy and pool, i only changed to another pool and the proxy has connected to it, inmediatelly the Cube has start mining. I changed to slush's pool that is the default for the proxy. The problem was that the proxy was unable to connect to the bitminter pool, but for sluch pool it works like a charm. Thanks for try to help me guys, thx a lot. One more question, can i mine scrypt with Cgminer-Kalroth (a mod of cgminer) and sha256 on another Cgminer?