Players getting kicked with AuthTicketCanceled

Good day
Recently we created a Rust server, everything went smoothly for quite a while, but lately we've been experiencing a strange issue. Most of our players are getting kicked automatically,with the following message: AuthTicketCanceled. I searched the internet far and wide and I can't find a solution for this. Do you guys have any suggestions ?

Thanks

 

I think this just means that they started joining the server but then they closed the game or pressed cancel.

 

Thats client side nothing you can do