Two physical sites in the same vCenter. One site was physically moved to the same place as the other physical site. In the process IP addresses changed and the sites VM were being replicated with a add-on server, which stopped working with the IP change.
VLSR (All versions)
Issue is caused by the host IP's being changed and the vSphere Replication add-on not working properly.
Remove the vSphere Replication Add-on Server and stop the replications and retain the seeds.
Recreate the replications and use the seeds already created.