These error is thrown when a VM participating in an Enhanced Replication configuration is unable to replicate.
The virtual machine host does not support enhanced replication.
A replication error occurred at the vSphere Replication Server for replication X . Details: 'No connection to VR Server for virtual machine Y on host Z in cluster A: Unknown'.
Replication job "Not Active"
vSphere Replication 9.x
Prerequisites
vSphere Replication Enhanced Replication Mappings
Failure to adhere to the vSphere Enhanced Replication prerequisites results is replication task configuration issues.
To use the enhanced replication capabilities with vSphere Replication, you must reconfigure your existing replication to use Enhanced replication mode.
Check for vib from cli
# chkconfig --list | grep -i hbr
# localcli software vib list | grep -i hbr
vmware-hbrsrv 8.0.2-0.0.22380479 VMware VMwareCertified 2024-01-04 host
vmware-hbr-agent 8.0.1-0.0.21471995 VMware VMwareCertified 2023-07-18 host
# localcli software vib get | grep -i hbr
# localcli software vib list | grep -i hbr
Installing vib from vSphere Replication 8.5.0.3 onwards, the HBR Agent VIB will no longer be installed automatically on hosts managed by vLCM clusters. However, vSphere Replication will continue to install the HBR Agent VIB on all standalone hosts and hosts, which are a part of non-vLCM managed clusters. This change has been implemented to prevent vSphere Replication from interfering with vLCM’s operations. For hosts not part of vLCM clusters it will continue to use VUM to install the HBR Agent VIB.
# localcli software vib install -v /tmp/vmware-hbr-agent-8.0.3-0.0.23167363.i386.vib
# chkconfig hbr on|off
On source ESXi host
# nc -z [target-ESX] 31031
# nc -z [target-ESX] 32032
# openssl s_client -connect <IP>:<port>
eg:
# openssl s_client -connect esx001b.vcf.lab:32032
Check routeability between hosts . Run on source ESXi to target ESXi
# traceroute [target-ESX]
Run a watch command on ESXi hosts and VR/VC nodes to compare timestamps
# watch -d date -u