If you upgrade your vcenter then get errors when you esx servers are trying to update the virtualcenter agent.
Follow the directions in this post
To save you some time here is the directions that fixed the issue for me:
You could manually try to install the agent as follows:
– Copy the vpx-upgrade-esx-6-linux-32042 from the upgrade folder in the VC folder to /tmp on the ESX server
– run the command sh vpx-upgrade-esx-6-linux-32042
(By default the script is located in C:\program files\vmware\vmware virtualcenter\upgrade )
Next restart management services:
service mgmt-vmware restart
After completing the above steps, try to reconnect to the esx
Here are some helpful post on setting up delegation on print servers, this includes some powershell scripts to help.