[GTAguillaume]

pawn Код:

format(string2, sizeof(string2), "IP=%s", dini_Get(name2, "IP"));

Why this?

Код:

if(strcmp(string2, IP, true))

You forgot a '!'.

pawn Код:

public OnPlayerConnect(playerid)
{

  new IP[56];
  new name2[MAX_PLAYER_NAME];
  GetPlayerName(playerid, name2, sizeof(name2));
  GetPlayerIp(playerid, IP, 56);
  if(!strcmp(dini_Get(name2, "IP"), IP, true)) { OnPlayerLogin(playerid); }
  return 1;
}