VMware ESXi host disconnects and do not connect back to vCenter

Issue:


ESXi host disconnects from vCenter. And if tried to reconnect, the activity fails at 89%


Error from vCenter :


A general system error occurred: internal error
Processing data from vCenter agent on ESXi01


Snippets from the vpxd logs from vCenter:


===============================================================
2016-03-29T12:28:37.644+05:30 error vpxd[14460] [Originator@6876 sub=HttpConnectionPool-000001] [ConnectComplete] Connect failed to <cs p:000000001099ab00, TCP:IP Address:443>; cnx: (null), error: class Vmacore::Ssl::SSLVerifyException(SSL Exception: Verification parameters:
--> PeerThumbprint: Thumbprint
--> ExpectedThumbprint: 
--> ExpectedPeerName: IP/Hostname
--> The remote host certificate has these problems:
--> 
--> * The host certificate chain is incomplete.
--> 
--> * Host name does not match the subject name(s) in certificate.
--> 
--> * unable to get local issuer certificate)
===================================================================


Troubleshooting:


• vCenter was not able to recognize this host due to incorrect certificate
• Regenerate the certificate on the host (VMware Link)
• Log in to SSH of the host
• Browse /etc/vmware/ssl and backup the existing certificate and remove it
• Run the command /sbin/generate-certificates to regenerate the certificate
• Restart the services using the command services.sh restart
• Verify that the certificates are regenerated
• Try to reconnect the host in vCenter and you will receive the below error:

Authenticity of the host's SSL certificate is not verified.

• You will be prompted for credentials again
• If your cluster is using EVC mode, you will receive a new error (VMware KB 1012864):

The host cannot be admitted to the cluster's current Enhanced vMotion Compatibility mode. Powered-on or suspended virtual machines on the host may be using CPU features hidden by that mode.

• Now you may need to note down the folders used by VMs in the affected host and remove the host from vCenter inventory
• Try to add the host outside the cluster.
• As expected, you will need to reconnect to the old dvSwitch.
• Once done, move the host to the cluster.
• Move the VMs to their respective folders