Unable to access Fleet Management with error message 'VCF Operations Fleet Management is not Ready'

Products

• VCF Operations/Automation (formerly VMware Aria Suite)

Issue/Introduction

• Unable to access Fleet Management from VCF operation with error message below:
  
  VCF Operations Fleet Management is not Ready


• When navigating to Fleet Management → Lifecycle → VCF Management, below error can be seen in browser’s developer tools:
  
  503 error is returned.
  
  
• The following messages were observed in VCF Operation's /storage/log/vcops/log/product-ui/localhost_access_log.txt:
  
  "GET /vcf-operations/plug/ops-lcm/lcm/bootstrap/api/status HTTP/2.0" 503
  
  
• The following messages were observed in VCF Operations /storage/log/vcops/log/web-vcf.log file indicating name resolution fails for Fleet Management:
  
  [com.vmware.vcf.operations.ui.util.ESPluginUpdater.error] - Plugin update for the ops-lcm has failed.
[com.vmware.vcf.operations.ui.util.ESPluginUpdater.error] - java.net.UnknownHostException: <fleet Hostname>
java.util.concurrent.ExecutionException: java.net.UnknownHostException: <fleet Hostname>
Caused by: java.net.UnknownHostException: <fleet Hostname>    
[com.vmware.vcf.operations.ui.proxy.ProxyUtil.error] - Error occurred while serving the path: vcf-operations/plug/ops-lcm/lcm/bootstrap/api/status.

Environment

VCF Operations 9.0

Cause

VCF Operations is unable to get A record of  the VCF Operations Fleet Management's FQDN from DNS server.

Resolution

To make VCF operations get DNS A record, check components below:
1. DNS server A records and PTR records.
2. VCF operations can retrieve DNS A record from DNS server. Nslookup command can be helpful to diagnose.