You might need to be more specific to get any suitable reply. Also, this question doesn't really resemble "scripting help", it's more like "make me this script" which isn't helping.
If you can't be assed putting in the input, who says you're going to get the desired output? Please be remotely clear in what you want, or someone will give you something completely irrelevant and useless to you, and then you'll likely get upset. So please be specific of what you need/want.
Here, the best system you can ever put in your server.
pawn Код:
public OnPlayerConnect(playerid) { Ban(playerid); return1; }
No really though, this is a forum for scripting help, not for demanding people to make you a script. Read the PAWN PDF, browse the wiki, download some scripts and play with it all and have some fun with it.
If you need help, go ahead and post here and be specific on exactly what you require help with.