cgminer is sayng
Pool 0 Slow/down or url or credentials invalid

my scrypt:
cgminer.exe --keccak -o 127.0.0.1:8868 -u **** -p **** --gpu-platform 0 -d 0 -w 256 -v 1 -I 16 -g 1 -l 1  --thread-concurrency 6144 -T

someone can help me ?