[libvirt] can't receive keepalive message during migration

[Hu Tao]

Hi,
 
When testing migration, I found a problem that the server can't receive
keepalive reply from client when doing migration. The log shows that
virsh did send the keepalive reply, but server didn't reveive it.

The strange part is it's OK to migrate from host A to Host B, but always
fails to migrate from host B to host A. When disable keepalive,
migration will success.

Any ideas?

-- 
Thanks,
Hu Tao
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