1 - you should explain a bit of context: where do you get this error message. I suspect you got it on you windows client (which version?) while trying to authenticate against Windows domain. Correct? Anyway, please elaborate a bit...
2 - Was everything working previously? did you change anything? Again, with no explanation from your side, it's very difficult to help you.
3 - Asking for help again after less than 15 minutes is a bit pushy, don't you think so? Be patient and investigate on your side while waiting for community help. It's maybe only cultural difference but, trust me, it doesn’t help