Hello hongchuong
You don't need to open port 902 on the vCenter server.
However there has been a bug related to V2V from Hyper-V with sparse disks, which has the same symptoms.
As a workaround you may try to force file-level cloning (I haven't tested that but hope it will work). You may, e.g, shrink a destination volume a little or change the cluster size to force file-level.
HTH
Plamen