That's from a security plugin witch is added in server , i think. Its added to prevent the so called "Hackers" who are trying to evade the ban. If you retry to connect it should not kick you , it dose the same to me but after rejoining the server its fine.
Hey everyone, just wanted to give you an update regarding the Steam connectivity issue some players have been experiencing recently.
I contacted our host about the problem, as several players have reported that they are getting an error when trying to play on our server. What makes this a bit unusual is that some of the affected players are able to play on other servers through Steam without any issues, while the problem only occurs on our server.