Weird issue I encountered after I deployed vSphere Replication appliance on my upgraded vSphere 5.5 lab. I was able to configure vSphere replication for a VM but for strange reasons, the VM replication shows as Not Active. This worked fine when I was still using vSphere 5.1/VR 5.1. The hostd.log file shows the following error:
The configuration for vSphere Replication all looks good, all are green so I can’t figure out what’s wrong here.
Luckily, I found a VM community post which is similar to my issue found here
I remember that in 5.1, I configured a vSphere Replication vmkernel port tick box in web client. This vmkernel port tick box is now removed in vSphere 5.5. As far as I know, that tick box is useless in vSphere 5.1 coz even though its checked, VR traffic will always default to the management vmkernel. See Sunny Dua’s article on properly configuring a different management network for vSphere replication
Going back to my issue, I followed the suggestion to remove the lines similar to the following in esx.conf of the ESXi host:
/net/vmkernelnic/child/tags/4 = “true”
The number  may change depending on the environment. On mine its . After making the change and rebooting the ESXi hosts, vSphere Replication started working fine again.