what's wrong with the openbsd-netcat?

[lei yang]

Hi experts

On my OS, I run kvm with below comand to do the migrate: it meet below error
1)
#qemu-system-x86_64 --enable-kvm -smp 2 -m 512 -net nic,model=e1000
-net tap,script=/etc/qemu-ifup -hda /boot/guest_img.raw  -kernel
/boot/bzImage -append "root=/dev/hda rw console=ttyS0,115200 ip=dhcp
selinux=0" -nographic -incoming "exec:nc -l 5200"
it print:
nc: Protocol not available
load of migration failed

2)Then I copy the "nc" binary from redhat, then it works well

can you please help me about this issue?

Lei