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No sure whether it is the same problem or not.Hotplug/hotunplug port will hit such error: Ncat: Connection refused--->on host Version: # uname -r 3.10.0-216.el7.x86_64 # rpm -q qemu-kvm-rhev qemu-kvm-rhev-2.1.2-16.el7.x86_64 Guest: 3.10.0-216.el7.x86_64 Steps: 1.Boot guest ...-device virtio-serial-pci,id=virtio-serial0,max_ports=3,vectors=4,bus=pci.0,addr=0x5 -chardev socket,id=channel0,path=/var/lib/libvirt/qemu/rhel58.channel0,server,nowait -chardev socket,id=channel1,path=/var/lib/libvirt/qemu/rhel58.channel1,server,nowait 2.hotplug port {"execute":"device_add","arguments":{"driver":"virtserialport","bus":"virtio-serial0.0","nr":"1","chardev":"channel0","name": "org.linux-kvm.port.0","id":"port0"}} {"return": {}} 3.Tried to transfer data-->successfully 4.hotunplug port {"execute":"device_del","arguments":{"id":"port0"}} 5.hotplug port again .. {"execute":"device_add","arguments":{"driver":"virtserialport","bus":"virtio-serial0.0","nr":"1","chardev":"channel0","name": "org.linux-kvm.port.0","id":"port0"}} {"return": {}} 6.Tried to transfer data In guest # cat lang.txt >/dev/vport2p1 Host: # nc -U /var/lib/libvirt/qemu/rhel58.channel0 Ncat: Connection refused. My CLI: /usr/libexec/qemu-kvm -enable-kvm -m 8G -smp 8 -name VM -uuid `uuidgen` -nodefaults -rtc base=utc -drive file=iscsi://10.66.90.100:3260/iqn.2001-05.com.equallogic\:0-8a0906-6ca1f7d03-9f7f4a4673153e85-s2-flang-310194/0,if=none,id=drive-data-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop,serial=QEMU-DISK2 -device virtio-scsi-pci,bus=pci.0,addr=0x7,id=scsi1 -device scsi-hd,bus=scsi1.0,drive=drive-data-disk,id=data-disk -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:60:3f:29,addr=0x4 -monitor stdio -boot menu=on,order=d -qmp tcp:0:4447,server,nowait -spice port=8000,disable-ticketing -vga qxl -vga std -device virtio-balloon-pci,bus=pci.0,id=balloon0 -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -device virtio-serial-pci,id=virtio-serial0,max_ports=3,vectors=4,bus=pci.0,addr=0x5 -chardev socket,id=channel0,path=/var/lib/libvirt/qemu/rhel58.channel0,server,nowait -chardev socket,id=channel1,path=/var/lib/libvirt/qemu/rhel58.channel1,server,nowait