#exec ban [id] doesn't work

[Uncle_Kalashnikov 0]

Hello, so I'm having a problem with my dedicated server, and it's that whenever I have to ban someone due to cheating or else, it will only be possible if I happen to be in-game and logged in as admin, and banning them thorugh the player list that shows up when you open the map (where it says mute, kick, ban). If I try to ban them through their ID it just won't work, it'll be as if I had not entered any command at all. It has happened that some cheaters log off the server before I can ban them in-game so it's impossible for me to keep them out. Appart from getting #exec ban to work, is there a way to ban them from outside the game? There has to be a way to ban through settings or something that doesn't require me to be playing. Thanks in advance.