https://kobo.suprnova.cc/index.php?page=gettingstarted
Another issue:
./minerd -a x15 -t 6 -s 4 -o stratum+tcp://kobo.suprnova.cc:5057 -u drazha.worker -p worker
[2015-02-04 13:41:39] Starting Stratum on stratum+tcp://kobo.suprnova.cc:5057
[2015-02-04 13:41:39] 6 miner threads started, using 'x15' algorithm.
[2015-02-04 13:41:39] Binding thread 2 to cpu 0
[2015-02-04 13:41:39] Binding thread 4 to cpu 0
[2015-02-04 13:41:39] Binding thread 1 to cpu 1
[2015-02-04 13:41:39] Binding thread 3 to cpu 1
[2015-02-04 13:41:39] Binding thread 0 to cpu 0
[2015-02-04 13:41:39] Binding thread 5 to cpu 1
[2015-02-04 13:41:41] Stratum connection failed: Failed to connect to kobo.suprnova.cc port 5057: Connection refused
[2015-02-04 13:41:41] ...retry after 10 seconds
Seems nothing is working on port 5057?
Also, for sgminer, there are more than one editions. Most of them working with the argument "-k bitblock" or "-algorithm bitblock"
Download:
https://www.nicehash.com/index.jsp?p=software