Hi,
I'm trying to start mining but I get "stratum authentication failed" all the time
I use this command         minerd -a X11 -o stratum+tcp://drkpool.com:3333 -u workerusername -p password  
workerusername  and password are the ones I create at the pool .
Do I have to use a wallet to do that ? Can I download it later ?
Am I missing something ?

Thanks in advance,