BE tube or do you mean BE Cube?

I've tried to get the stratum proxy running for solo mining via the Qt wallet and gave up very quickly. Much simpler way is to install Bfgminer and proxy through that using the --http-port option, works a dream. Don't forget to run the Bitcoin-Qt with the -server argument.

Although it has to be said if you are only planning on solo mining with a BE Cube, you're wasting you're time, you will never solve a block.