If you get a "Terminal - not permitted (9)" message box when trying to open Terminal, then your device has probably been hacked, see this thread: Device got hacked 1 min after connected to internet. If that's the case, then it's now time to Netinstall. After Netinstall, set a secure password and apply the default firewall configuration from MikroTik (which your CCR devices does not have): Buying - RB1100AHx4 Dude Edition - Questions about Firewall - #4 by rextended.