[dugi]

Nothing new, the solution for it is in the gl_npcs filterscript from 2010:

Code:

//-------------------------------------------------
// IMPORTANT: This restricts NPCs connecting from
// an IP address outside this server. If you need
// to connect NPCs externally you will need to modify
// the code in this callback.

public OnPlayerConnect(playerid)
{
	if(IsPlayerNPC(playerid)) {
	    new ip_addr_npc[64+1];
	    new ip_addr_server[64+1];
	    GetServerVarAsString("bind",ip_addr_server,64);
	    GetPlayerIp(playerid,ip_addr_npc,64);
	    
		if(!strlen(ip_addr_server)) {
		    ip_addr_server = "127.0.0.1";
		}
		
		if(strcmp(ip_addr_npc,ip_addr_server,true) != 0) {
		    // this bot is remote connecting
		    printf("NPC: Got a remote NPC connecting from %s and I'm kicking it.",ip_addr_npc);
		    Kick(playerid);
		    return 0;
		}
        printf("NPC: Connection from %s is allowed.",ip_addr_npc);
	}
	
	return 1;
}