Could not connect to one or more vCenter Server systems

To re-register the Inventory Service with vCenter Single Sign-On:
Open a command prompt on the Inventory Service host machine.

Change directory to:

C:\Program Files\VMware\Infrastructure\Inventory Service\scripts

Notes:
If you installed the vCenter Inventory Service in a different location from the default C:\Program Files\, adjust the path.
Typically, short names are not disabled. However, if you have disabled short names on your system, or have removed short names for the folder where the Inventory Service and vCenter Server are installed, follow these steps:

Open the regTool.cmd file with a text editor. The regTool.cmd file is located at:

installation_path\Inventory Service\sso

In the line beginning with set LOG4J_CONF=, enclose %TOOL_DIR% in quotation marks:

“%TOOL_DIR%”

Note: If the command fails, try again without quotation marks.

Save and close the file.

Run the is-change-sso.bat command to update the stored configuration information of the Inventory Service:

is-change-sso.bat ssoServerUrl "ssoAdminuser" "ssoAdminPassword"

Use this example as a model:

In vCenter Server 5.1:

is-change-sso.bat https://machinename.corp.com:7444/lookupservice/sdk "admin@System-Domain" "SSO_pw1@"

In vCenter Server 5.5:

is-change-sso.bat https://machinename.corp.com:7444/lookupservice/sdk "administrator@vSphere.local" "SSO_pw1@"

In this example, 7444 is the default HTTPS port number for vCenter Single Sign-On. If you use a custom port, replace the port number in the example with the port number you use. The quotation marks are required to escape special characters in the Single Sign-On user name and password.

Restart the Inventory Service:

net stop vimQueryService
net start vimQueryService
The vCenter Inventory Service URL configuration is now updated and the Inventory Service is re-registered with vCenter Single Sign-On.

Note: If you are re-registering the Inventory Service to the same Single Sign-On instance, you must also re-register vCenter Server

To re-register vCenter Server with the Inventory Service:
Open a command prompt.
Change directory to:

C:\Program Files\VMware\Infrastructure\VirtualCenter Server\isregtool

Note: If you installed the vCenter Server in a location other than the default C:\Program Files\, adjust the path.

Run the register-is.bat command to update the stored configuration information of the Inventory Service:

register-is.bat vCenter_Server_URL Inventory_Service_URL Lookup_Service_URL

Use this example as a model:

register-is.bat https://machinename.corp.com:443/sdk https://machinename.corp.com:10443 https://machinename.corp.com:7444/lookupservice/sdk

In this example, 443, 10443, and 7444 are the default HTTPS port numbers for vCenter Server, the Inventory Service, and vCenter Single Sign-On respectively. If you use custom ports, replace the port numbers in the example with the port numbers you use. The server FQDN should be used rather than an IP address for machinename.corp.com. If an IP address is used, you may see the SslHandshakeFailed=1 error.

Restart vCenter Server.
The vCenter Inventory Service URL configuration is now updated and vCenter Server is re-registered with the Inventory Service.