vSphere Replication uses default network ports for intrasite communication between hosts at a single site and intersite communication between hosts at the protected and recovery sites.
For a list of all the ports that must be open for vSphere Replication, see http://kb.vmware.com/kb/2087769.
For the list of default ports that all VMware products use, see http://kb.vmware.com/kb/1012382.
