To convert a remote physical machine vCenter Converter requires the following TCP ports to be open:

A.
138, 443, 902 and 905

B.
137, 443 and 902

C.
139, 902 and 905

D.
139, 443, 445 and 902

Explanation:
Required Ports
Converter Enterprise for VirtualCenter (plugin)
Converter Enterprise Server to remote physical machine TCP 445, 139 and UDP 137,
138
Converter Enterprise Server to VirtualCenter Server 443
Converter Enterprise Client to Converter Enterprise Server 443
Physical machine to VirtualCenter Server 443
Physical machine to ESX Server 443, 902