print error when connection failure
print error when connection failure

wcy123/erl_tool,zhangchaoeasemob/erl_tool,zhangchaoeasemob/erl_tool,wcy123/erl_tool,zhangchaoeasemob/erl_tool,wcy123/erl_tool,zhangchaoeasemob/erl_tool,wcy123/erl_tool,zhangchaoeasemob/erl_tool,zhuxiangkui/erl_tool,zhuxiangkui/erl_tool,wcy123/erl_tool,zhuxiangkui/erl_tool,zhuxiangkui/erl_tool,zhuxiangkui/erl_tool