VMware has become aware of an issue where an upgrade to vSphere 5.5 may fail when upgrading the SSO component. The issue appears to be related to the default SSO certificate generated when installing vSphere 5.1 Build #799735
For details and updates on this issue refer to KB article: vSphere 5.5 Single Sign-On upgrade rolls back after importing Lookup Service data (2060511)
Related info:
Location of Single Sign On log files for vCenter Server 5.1 (2033430)
Nice
..got that error since yesterday..and tried almost everything..at the end i’ve opened an SR
Try changing HKLM\Software\VMware, Inc.\VMware Infrastructure\SSOServer\FqdnIP from the ip address to the FQDN, I struggled with this for a while and this seemed to resolve