STRATUMPROXY="disable"
if  dwarfpool STRATUMPROXY is enable, pls take out the -RH options.

pls try to disable the  dwarfpool STRATUMPROXY, ethminer got build-in stratum proxy as well, it work great also..

just 3 step:-

Put in ur wallet address
put in ur pool address
save and restart.

If still cannot, maybe you need to re-image the pen-drive.

Happy Mining.. ^_^