Remote Desktop, by default, allows two connections at a time and requires additional licensing to allow more connections. Every connection counts towards the 2 connection limit, even the System Administrators. Only “Administrator” can login once the default two connections are in use, which allows the “Administrator” to forcefully disconnect the inactive/idle yet still connected sessions. You should contact your System Administrator and have them login to the system to see who is tying up the connections and from there you will know whether or not your system has been hacked (hopefully/probably not). This usually happens when a System Administrator logs in and forgets to logoff or someone logs in (which could be the System Administrator) and times out which still leaves the connection. Once the maximum connections are reached it’s time for the System Administrator to help out. You should be able to figure this one out pretty quickly with assistance from your System Administrator.