I Cannot disconnect serial ports in the Management menu.
What type of connections are you disconnecting?
If they are RealPort, the daemon is expected to re-connect by design.
Other connections such as, serial bridge are persistent, as well.
I am using RealPort on a Linux server. I had a serial device that had its communications card replaced. Now the device will not fully communicate with the server. I have swapped cables with another device and the digi port will receive data but not send data to the device. I can move the device to another digi and it works.