You cannot use network encryption for vSphere Replication

When you try to configure network encryption for a replication, the option in the Configure replication wizard is inactive.

Problem

If you are using an older ESXi version, the hbr-agent.vib may not be automatically installed on the ESXi hosts and you cannot configure network encryption for these replications.

Solution

1. Establish an SSH connection to the vSphere Replication Appliance.
2. Run the following command: /opt/vmware/hms/bin/hms-configtool -cmd reconfig -property hms-auto-install-hbragent-vib=false.
3. Restart the HMS service.
4. Download and install the hbr-agent.vib on the ESXi hosts. See KB 2110304.