ESXi gets disconnected from vCenter server intermittantly

 Issue:

ESXi gets disconnected from vCenter server intermittantly

Solution:

This issue occurs when the UDP heartbeat message sent by ESX/ESXi host is not received by vCenter Server.

1. Select the vCenter object from the inventory under Hosts and Clusters.
2. Select the Manage or Configure tab.
3. Select Settings > Advanced Settings.
4. Click Edit. and add new value
5. In the Key field, type:
   
   config.vpxd.heartbeat.notRespondingTimeout
    
6. In the Value field, type:
   
   120
    
7. Click Add.
8. Click OK.

     9.SSH to vCenter with root credentails and restart below service:

 [ ~ ]# service-control --stop vmware-vpxd; service-control --start vmware-vpxd

Operation not cancellable. Please wait for it to finish...

Performing stop operation on service vpxd...

Successfully stopped service vpxd

Operation not cancellable. Please wait for it to finish...

Performing start operation on service vpxd...

Successfully started service vpxd