"Could not connect to one or more vCenter Server systems: https://vcenterfqdn:443/sdk" in vCenter ELM

Products

• VMware vCenter Server 7.0
• VMware vCenter Server 8.0

Issue/Introduction

Login to one of the vCenter servers in ELM( Enhanced Linked Mode), there is an error message in vSphere Client:

    "Could not connect to one or more vCenter Server systems: https://vcenterfqdn:443/sdk"

Environment

vCenter 7.0.x

vCenter 8.0.x

 

Cause

Certificates of vCenter VMCA are modified  by firewall or security softwares.

 

To verify it , run openssl command in VCSA  shell command:

echo | openssl s_client  -connect vc01.example.com:443  2>/dev/null  | grep -i issuer
  issuer=/CN=Untrusted

 

 This is an unexpected result.    It should return
     issuer=/CN=CA/DC=example/DC=com/C=US/ST=California/O=vc01.example.com/OU=VMware Engineering

 

Resolution

Let network team to check the firewall settings. and security  software.