Failed to connect to the source vCenter Server or ESXi container.

Products

• VMware vCenter Server

Issue/Introduction

An error may appear during VC upgrade stage 2.

Failed to connect to the source vCenter Server or ESXi container.
<VC-FQDN> port 443: [Errno -5] No address associated with hostname 

Cause

The connection from upgrading VC to source VC failed.

 

Resolution

• Access VC(vCenter) console from web console. (The SSH service is stopped by default.)
• Ping source VC FQDN. Ping is expected to be failed in this situation.
• Ping source VC IP address
  • If ping fails, check network connectivity between VC and connection destination following Troubleshooting virtual machine network connection issues and Intermittent network connectivity on ESXi or host disconnect issues.
  • if ping succeeds
    • Verify DNS resolution result with command below.

      nslookup <destination-FQDN>

    • If there's no DNS entry, please update DNS entry at DNS server, or add DNS entry at VC's /etc/hosts following Adding/Deleting/Editing a host entry on vCenter server or ESXi host using vi editor.
    • If there's a DNS entry, please check network connectivity between VC and connection destination following Troubleshooting virtual machine network connection issues and Intermittent network connectivity on ESXi or host disconnect issues.