[Face9000]

Is there any way to do an anti ban evasion for players?

[6d]

Yes Sir,
It's possible.
You have to make a field in the user file that say "Bevade", if it's set to 1 or to true then when he joins the server he is auto-banned.
Useful includes may be dini.inc for saving stuff.
A example of this should be:

This one on the command (with dini)

pawn Код:

dini_IntSet(playerfile, "Bevade", 1);

This one OnPlayerConnect (with dini)

pawn Код:

if(dini_Int(playerfile, "Bevade")==1)
{
    Ban(playerid);
}

I may be doing a tutorial on this later if you still need help.

[Face9000]

Yes i will appreciate much!

[MetallicAnt]

Yes, a tutorial would be very useful, I have the same problem with an unregistered user here, and I have no idea what to do with this guy..

[Issam]

As the guy said, make a field on the userstate so once the guy is banned, he's account is going to be locked and if he joins again, he will get banned automatically, but the problem is if he ban evades using another nickname, it wont work.