Server-side only. Ip ban and prevent incomming connections from a given ip.
_Io_Ban($socketOrIp, $nTime = 3600, $sReason = "Banned", $sIssuedBy = "system")
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$nTime is seconds. Default is therefore 1 hour. A banned client will receive the `banned` event when trying to connect. If you close the server. All bans will persist when you start it up again.