Disconnecting and Reconnecting a Host - VMware
docs.vmware.com › en › VMware-vSphereFeb 12, 2020 · vCenter Server uses an SSL certificate to encrypt and decrypt host passwords stored in the vCenter Server database. If the certificate is replaced or changed, vCenter Server cannot decrypt host passwords, and therefore cannot connect to managed hosts. If vCenter Server fails to decrypt a host password, the host is disconnected from vCenter Server.
Troubleshooting an ESXi host in a "not responding ... - VMware
kb.vmware.com › s › articleApr 06, 2021 · This article provides steps to troubleshoot when an ESXi is in disconnected or a not responding state in vCenter Server. In addition, it provides steps to help you eliminate common causes for your problem by verifying that the configuration of your networking and management server agents is correct and confirm the availability of resources on your ESXi host.