deltanight

Hello, I just have get banned for no reason from a server. I am playing with the Arma free version up to date. The server have a green circle in the list, so i don't understand the problem ! The thing is that i get banned just after i joined the server ! Thanks for help !

Where can i see the reason ? It just tells me "you have been banned" that's all. I don't think it is beacuse of my ping, the first time i joined i had about 48ms.