After updating vCenter Server, Site Recovery plugin shows "no healthy Upstream"
In lookup service log file var/log/vmware/lookupsvc/lookupserver-default.log, you can see lines similar to
<timstamp> WARN com.vmware.vim.lookup.impl.LdapStorage] Failed to get endpoint host for <SRM_APPLIANCE_HOSTNAME>. java.lang.IllegalArgumentException: URI is not absolute
<timstamp> WARN com.vmware.vim.lookup.impl.LdapStorage] Failed to get endpoint host for <SRM_APPLIANCE_HOSTNAME>. java.lang.IllegalArgumentException: URI is not absolute
vCenter Server 8.x
vSphere Replication 9.x
Site Recovery Manager 9.x
This issue can occur when SRM and vSphere Replication appliances are configured with hostnames and not FQDNs.
Reconfigure SRM and vSphere replication appliance with FQDN instead of hostname
Reconfigure vSphere Replication Server Settings
Prerequisites and Best Practices for Site Recovery Manager Server Deployment