Admin of pool
http://bc.greekpool.eu/You can check configuration of stratum seems bad configured.
Blocktime is 1 minutes and send share 1 minutes ( difficulty 512 )
You can send your value for option next ?
# Pool Target (Base Difficulty)
POOL_TARGET = 16 # Pool-wide difficulty target int >= 1
VARIABLE_DIFF = True # Master variable difficulty enable
DIFF_UPDATE_FREQUENCY = 45 # Update the litecoin difficulty once a day for the VARDIFF maximum
VDIFF_MIN_TARGET = 2 # Minimum Target difficulty
VDIFF_MAX_TARGET = 1024 # Maximum Target difficulty
VDIFF_TARGET_TIME = 10 # Target time per share (i.e. try to get 1 share per this many seconds)
VDIFF_RETARGET_TIME = 30 # Check to see if we should retarget this often
VDIFF_VARIANCE_PERCENT = 30 # Allow average time to very this % from target without retarget
Surtout VDIFF_TARGET_TIME et VDIFF_VARIANCE_PERCENT