VCF deployment with existing vCenter Server fails with error "Specified release version 9.1.0.0 is not compatible with the supported versions ()"

Products

• VMware SDDC Manager / VCF Installer

Issue/Introduction

• VCF deployment with existing vCenter Server failed on Versions and Bundles of Validation & Deploy:
  
  Specified release version 9.1.0.0 is not compatible with the supported versions ()
Remediation: Use a supported VCF release version


• The existing vCenter Server and ESX hosts as well as other components are all 9.1.0.0100 already. 
• VCF Installer has been configured with multiple DNS servers but the forwarded and reversed resolution are not always working which can be verified with nslookup.

Environment

VMware Cloud Foundation 9.1.0

Cause

The issue is caused by one of the DNS servers is not working and causing /v1/system/appliance-info to return result for 15 seconds which eventually hits client timeouts in the domainmanager service. The issue is also seen in the validation that reverse DNS lookup has failed.

Resolution

1. Verify which DNS server is not working on forward and reserve resolution:
   
   
   1. SSH VCF Installer with vcf account and switch to root account.
   2. Run the nslookup command. 
   3. Specify DNS server for resolution with the command:
      
      > server <dns-server-ip>
      
      
   4. Input one of component FQDN for forward resolution:
      
      > <input-component-fqdn>
      
      The output will give the IP address of the component expectedly. Otherwise the DNS server is bad. 
      
      
   5. Input the component IP for reserve resolution:
      
      > <input-component-ip>
      
      The output will give the FQDN of the component expectedly. Otherwise the DNS server is bad. 
      
      
2. After confirm which DNS server is not working, remove it from VCF Installer by following the Configure/Update DNS Server IP Address in SDDC Manager or the VCF Installer through Command Line