vCenter Server 5.5 does not support Windows Server 2003 hosts for vCenter Server. When you migrate from a Windows Server 2003 host to a host that is supported for vCenter Server 5.5, install vCenter Single Sign-On on the new host.

This procedure installs vCenter Single Sign-On in standalone mode. To install vCenter Single Sign-On in with multiple instances in the same or different sites, see the vSphere Installation and Setup documentation.

Note: vCenter Server 5.5 supports connection between vCenter Server and vCenter Server components by IP address only if the IP address is IPv4-compliant. To connect to a vCenter Server system in an IPv6 environment, you must use the fully qualified domain name (FQDN) or host name of the vCenter Server. The best practice is to use the FQDN, which works in all cases, instead of the IP address, which can change if assigned by DHCP.


  1. In the software installer directory, double-click the autorun.exe file to start the installer.
  2. Under Custom Install, select vCenter Single Sign-On, and click Install.
  3. Follow the prompts in the installation wizard to choose the installer language, and agree to the end user patent and license agreements.
  4. Accept or change the HTTPS port for vCenter Single Sign-On.
  5. Select the deployment mode Standalone vCenter Single Sign-On Server.
  6. Set the password for the vCenter Single Sign-On administrator account.

    This is the password for the user administrator@vsphere.local. vsphere.local is a new domain that is created by vCenter Single Sign-On. After installation, you can log in to vCenter Single Sign-On and in to vCenter Server as adminstrator@vsphere.local.

    By default, the password must have at least eight characters, at least one lowercase character, one uppercase character, one number, and one special character. See the vSphere Security documentation for information about changing the password policy. The following characters are not supported in passwords: non-ASCII characters, semicolon (;), double quotation mark ("), single quotation mark ('), circumflex (^), and backslash (\).

  7. Enter the site name for vCenter Single Sign-On.
    Choose your own name for the vCenter Single Sign-On site.
  8. Review the installation options and click Install.


vCenter Single Sign-On is installed.