What are you using for config settings on miners?
I use a standard configuration - contents of the file diamond.conf
rpcuser=YYY
rpcpassword=XXX
rpcallowip=*
rpcport=9010
daemon=1
server=1
gen=0
maxconnections=100
addnode=213.229.0.41
addnode=193.77.159.166
addnode=113.168.158.16
addnode=193.68.21.19
What are you using to launch sgminer? Can you post the command line arguments?
standard settings for cards 7970
sgminer.exe -k groestlcoin -o http://192.168.1.10:9010 -u YYY -p XXX --gpu-engine 1100 --gpu-memclock 550 --shaders 2048 --thread-concurrency 8192 -I 20 -g 1 --worksize 256 --lookup-gap 0 --gpu-fan 40-100 --auto-fan --temp-target 60
you chose a nonstandard port? Make sure your firewall is either off or configured correctly for that port. try this:
save this as dmd.bat in your folder containing sgminer.exe.
These settings are for my sapphire 290x, so be sure to research good parameters for your hardware.
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
sgminer.exe -k groestlcoin -o 192.168.2.2:17772 -u YourUsername -p YourPassword --xintensity 400 -g 1 --thread-concurrency 24512 -w 512 --auto-fan --temp-target 82 --lookup-gap 0 --difficulty-multiplier 0.0039062500
then, in %appdata%\diamond\diamond.conf use this. Please update your class B ip address. Also, I think it's wise to use the standard port.
rpcallowip=127.0.0.1
rpcallowip=192.168.2.2
rpcuser=YourUsername
rpcpassword=YourPassword
rpcport=17772
addnode=213.229.0.41
addnode=193.77.159.166
addnode=113.168.158.16
addnode=193.68.21.19
server=1
listen=1
daemon=1