Thanks for your advice ...
I've tried two pools, litecoinpool and nicehash ...
It seems that with nicehash it holds the connection better, error 127.0.0.1:4028 does not appear, but I am not able to undermine.
At no time does the green light appear, it stays blinking in orange / yellow.
On the dashboard it appears active for a few seconds and is deactivated ... so constantly. Until the miner goes out of line
I have reviewed the credentials and passwords in the pool a thousand times and they are fine, I don't know where to go.