This reply was originally posted by Bill on APC forums on 2/25/2015
Sebastian,
That error indicates PCNS cannot find vCenter using the IP address or domain name provided. If using the domain name try using the IP address. If using the IP address test to see if PCNS VM can ping the address and verify that no other system is using or has used the IP address assigned to vCenter Server.
We have 2 Kbases the might help FA177754 and FA214252 and there is an interface that you can use on vCenter Server called the Managed Object Browser that allows you to check if everything is set-up correctly or if there are problems. It can be accessed via https:///mob. You need to log in as a VMware admin.
To check if vCenter Server IP/Hostname/FQDN can be located by what is stored in pcnsconfig.ini for vCenter Server.
Once in MOB. you need to click on the Content Link. Once in the Content Link, click on the SearchIndex link.
If you have added vCenter Server using the IP address - select FindByIP
In the FindByIP screen, clear the value under datacenter, enter the IP address and set vmSearch boolean "true".
Click Invoke Method.
If the IP address is found in the Inventory you should get a return value and a ManagedObjectReference which will show the VM (the VM name will appear beside it - note that this is the name as it appears in the vCenter Server Inventory, it may not be the same as the IP/FQDN.).
You can click on the MOR reference link for or more information about the VM (if its found). When you get the MOR value back make sure this is the VM that the vCenter Server VM is supposed to be not some other VM that is still present in the Inventory but powered off.
If you added the vCenter Server using the FQDN instead of the IP you use the FindByDNSName function instead.
If the VM cannot be found the MOR value will report back as VOID.