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.

Additional Information

If nslookup is returning the correct records from your machine, but the issue persists on the server, please verify your physical firewall settings. Ensure that the firewall is not blocking DNS traffic.