Can´t avoid getting unwanted People on the TS.

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So, on my TS there are a few let´s call them "Unwanted Persons" they´ve done stuff which isn´t okay and therefore I decided to ban them. The thing is, there are Friends of them on the TS which are friends of mine as well, so they´ll always have the possibility to get the IP and or a Password if I... Can´t avoid getting unwanted People on the TS.