make connection failed error message more meanful
make connection failed error message more meanful

open-falcon/falcon-plus,taomaree/falcon-plus,taomaree/falcon-plus,taomaree/falcon-plus,open-falcon/falcon-plus,jojohappy/falcon-plus,jojohappy/falcon-plus,open-falcon/falcon-plus,jojohappy/falcon-plus,jojohappy/falcon-plus,taomaree/falcon-plus,jojohappy/falcon-plus,jojohappy/falcon-plus,open-falcon/falcon-plus,taomaree/falcon-plus,taomaree/falcon-plus,open-falcon/falcon-plus