If the Loginsight Agent fails to deploy on SDDC manager for any reason you can manually run the 'install_li_agent.sh' script to retry the installation.
VCF 4.x
VCF 5.x
This is usually caused by environmental factors- for example if required port 9000 is closed/blocked.
SSH to SDDC manager, escalate to 'root' and run this command: > /opt/vmware/vcf/commonsvcs/scripts/install_li_agent.sh <vRLI_cluster_FQDN>
If the installation succeeds but SDDC manager still isn't available in vRLI restart the 'liagentd' service on SDDC manager and refresh vRLI UI.
> /etc/init.d/liagentd restart