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[libvirt-users] unable to migrate guests



I'm new to libvirt and I'm facing a problem while migrating the guest domain. 
Both guest and host are of the same config(checked it with uname -a)

Migrating using virsh, I get:

virsh # migrate hda2 --desturi qemu+ssh://root 10 129 54 254/system
root 10 129 54 254's password: 
error: operation failed: migration to 'tcp:kvm-lab:49168' failed: migration failed.


The details of the problem are shown by the Virtual machine manger are:

Unable to migrate guest: operation failed: migration to 'tcp:kvm-lab:49165' failed: migration failed

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 45, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/migrate.py", line 523, in _async_migrate
    vm.migrate(dstconn, migrate_uri, rate, live, secure, meter=meter)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1141, in migrate
    self._backend.migrate(destconn.vmm, flags, newname, interface, rate)
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 521, in migrate
    if ret is None:raise libvirtError('virDomainMigrate() failed', dom=self)
libvirtError: operation failed: migration to 'tcp:kvm-lab:49165' failed: migration failed

I've tried disabling apparmor and then migrating by-
pre pre-Inspiron-N4010:~$ sudo invoke-rc.d apparmor kill
.: 35: Can't open /lib/apparmor/functions
invoke-rc.d: initscript apparmor, action "kill" failed.

and
stopping iptables-
pre pre-Inspiron-N4010:~$ sudo /etc/init.d/iptables stop
[sudo] password for pre: 
sudo: /etc/init.d/iptables: command not found
Thank you.

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