im testing a antminer s2 in your plataform, but i got around 320 gh rejected and i have a difficulty of 2048. How can i make it work betteR?
Try updating your firmware (older firmwares with older versions of cgminers doesn't work well due to extranonce bug in cgminer) or try to use stratum-proxy:
https://www.nicehash.com/docs/connect-via-proxy