From vpxd.log of vCenter server appliance 5.5:-
2014-05-15T21:46:33.782Z [7F8F24E43740 info '[SSO][CreateSsoFacade]'] [CreateUserDirectory] Groupcheck URI set to: http://localhost:7080/sso-adminserver/sdk/vsphere.local
2014-05-15T21:46:34.091Z [7F8F24E43740 info '[SSO][SsoCertificateManagerImpl]'] Retrieved trusted STS certificate: C=US,CN=ssoserverSign\,dc=vsphere\,dc=local
2014-05-15T21:46:34.116Z [7F8F24E43740 info 'authvpxdMoSessionManager'] [SSO][SessionManagerMo::DownloadSTSRootCertificates] Admin URI set to: http://localhost:7080/sso-adminserver/sdk/vsphere.loca
l
2014-05-15T21:46:34.117Z [7F8F24E43740 info 'authvpxdMoSessionManager'] [SSO][SessionManagerMo::DownloadSTSRootCertificates] Downloading STS Root certificates ...
2014-05-15T21:46:34.185Z [7F8F24E43740 info '[SSO][SsoCertificateManagerImpl]'] Retrieved trusted STS certificate: C=US,CN=ssoserverSign\,dc=vsphere\,dc=local
2014-05-15T21:46:34.200Z [7F8F24E43740 info 'profileprofileUtil'] [DeserializeFromFile] reading data from file: /usr/lib/vmware-vpx/categorymeta_klnext.xml
2014-05-15T21:46:34.202Z [7F8F24E43740 info 'profileprofileUtil'] [DeserializeFromFile] reading data from file: /usr/lib/vmware-vpx/categorymeta_mn.xml
2014-05-15T21:46:34.202Z [7F8F24E43740 info 'profileprofileUtil'] [DeserializeFromFile] reading data from file: /usr/lib/vmware-vpx/componentmeta_klnext.xml
2014-05-15T21:46:34.203Z [7F8F24E43740 info 'profileprofileUtil'] [DeserializeFromFile] reading data from file: /usr/lib/vmware-vpx/componentmeta_mn.xml
2014-05-15T21:46:34.204Z [7F8F24E43740 info 'profileprofileUtil'] [DeserializeFromFile] reading data from file: /var/lib/vmware/hpMetadataCache.xml
2014-05-15T21:46:34.204Z [7F8F24E43740 error 'profileprofileUtil'] [DeserializeFromFile] reading failed: FileIO error: Could not find file : /var/lib/vmware/hpMetadataCache.xml
2014-05-15T21:46:34.204Z [7F8F24E43740 info 'profileprofileUtil'] [_LoadCache]: No cache data file found.
2014-05-15T21:46:34.221Z [7F8F24E43740 info 'vmcheckvmTestSet'] Looking for compat config file at /usr/lib/vmware-vpx/compatConfig.xml
2014-05-15T21:46:34.231Z [7F8F24E43740 warning 'commonvpxUtil'] [VpxVmomi] Found previous domain socket /var/run/vmware/vpxd-webserver-pipe. Removing...
2014-05-15T21:46:34.231Z [7F8F24E43740 info 'HttpSvc.HTTPService'] Using default for nonChunkingAgents: 'VMware VI Client|VMware-client|VMware-client/3.*'
2014-05-15T21:46:34.231Z [7F8F24E43740 info 'HttpSvc.HTTPService'] Using default for agentsNeedingContentLength: 'VMware-client'
2014-05-15T21:46:34.231Z [7F8F24E43740 info 'HttpSvc.HTTPService'] Max buffered response size is 104857600 bytes
2014-05-15T21:46:34.232Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] Failed to add LDAP entry CN=134B1EB4-1239-4995-A324-F0A1846A0746,OU=ComponentSpecs,OU=Health,dc=virtualcenter,dc=vmw
are,dc=int: 0x68 (Already exists)
2014-05-15T21:46:34.232Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] LdapApi::add_s: key (vmw-vc-URL)
2014-05-15T21:46:34.232Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] LdapApi::add_s: key (objectClass)
2014-05-15T21:46:34.232Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] LdapApi::add_s: key (vmw-vc-HealthComponentType)
2014-05-15T21:46:34.232Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] LdapApi::add_s: key (vmw-vc-SSLThumbprint)
2014-05-15T21:46:34.232Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] LdapApi::add_s: key (vmw-vc-HealthComponentName)
2014-05-15T21:46:34.233Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] Failed to add LDAP entry CN=134B1EB4-1239-4995-A324-F0A1846A0746.vpxd,CN=134B1EB4-1239-4995-A324-F0A1846A0746,OU=Com
ponentSpecs,OU=Health,dc=virtualcenter,dc=vmware,dc=int: 0x68 (Already exists)
2014-05-15T21:46:34.233Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] LdapApi::add_s: key (vmw-vc-URL)
2014-05-15T21:46:34.233Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] LdapApi::add_s: key (objectClass)
2014-05-15T21:46:34.233Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] LdapApi::add_s: key (vmw-vc-HealthComponentType)
2014-05-15T21:46:34.233Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] LdapApi::add_s: key (vmw-vc-SSLThumbprint)
2014-05-15T21:46:34.233Z [7F8F24E43740 error 'linuxvpxLdap_linux'] [LDAP Client] LdapApi::add_s: key (vmw-vc-HealthComponentName)
2014-05-15T21:46:34.390Z [7F8F24E43740 info 'vpxdvpxdMoDiagnosticManager'] [DiagnosticManagerMo] Running support script located at /usr/lib/vmware-vpx/vc-support.sh
2014-05-15T21:46:34.392Z [7F8F24E43740 info 'vpxdvpxdMoOptionManager'] [OptionManagerMo] Invoking callbacks for key vpxd.usageStats.persist, pre commit
2014-05-15T21:46:34.392Z [7F8F24E43740 info 'vpxdvpxdMoOptionManager'] [OptionManagerMo] Invoking callbacks for key vpxd.usageStats.persist, pre commit
2014-05-15T21:46:34.392Z [7F8F24E43740 info 'vpxdvpxdMoOptionManager'] [OptionManagerMo] No change to vpxd.usageStats.persist
2014-05-15T21:46:34.392Z [7F8F24E43740 info 'vpxdvpxdMoOptionManager'] [OptionManagerMo] Invoking callbacks for key vpxd.usageStats.level, pre commit
2014-05-15T21:46:34.392Z [7F8F24E43740 info 'vpxdvpxdMoOptionManager'] [OptionManagerMo] Invoking callbacks for key vpxd.usageStats.level, pre commit
2014-05-15T21:46:34.392Z [7F8F24E43740 info 'vpxdvpxdMoOptionManager'] [OptionManagerMo] No change to vpxd.usageStats.level
2014-05-15T21:46:34.393Z [7F8F24E43740 info 'vpxdvpxdMoOptionManager'] [OptionManagerMo] Invoking callbacks for key vpxd.usageStats.duration, pre commit
2014-05-15T21:46:34.393Z [7F8F24E43740 info 'vpxdvpxdMoOptionManager'] [OptionManagerMo] Invoking callbacks for key vpxd.usageStats.duration, pre commit
2014-05-15T21:46:34.393Z [7F8F24E43740 info 'vpxdvpxdMoOptionManager'] [OptionManagerMo] No change to vpxd.usageStats.duration
2014-05-15T21:46:34.408Z [7F8F24E43740 info 'vpxdvpxdMoCbrcManager'] [CbrcManagerMo::Init]
2014-05-15T21:46:34.410Z [7F8F24E43740 info 'ProxySvc'] Max proxy connections currently set to 2048 , buffer size: 16344 bytes
2014-05-15T21:46:34.410Z [7F8F24E43740 info 'ProxySvc'] vmacore/ssl/useSSLCtxPool: true
2014-05-15T21:46:34.411Z [7F8F24E43740 info 'ProxySvc'] vmacore/ssl/serializeServerHandshake: false
2014-05-15T21:46:34.412Z [7F8F24E43740 info 'ProxySvc'] Max proxy connections currently set to 2048 , buffer size: 16344 bytes
2014-05-15T21:46:34.415Z [7F8F24E43740 warning 'VpxProfiler'] ServerApp::Init [TotalTime] took 4372 ms
2014-05-15T21:46:34.416Z [7F8F24E43740 error 'vpxdvpxdMain'] [VpxdMain] Failed to initialize: vmodl.fault.InvalidArgument
2014-05-15T21:46:34.416Z [7F8F24E43740 error 'Default'] Failed to intialize VMware VirtualCenter. Shutting down...
2014-05-15T21:46:34.416Z [7F8F24E43740 info 'vpxdvpxdSupportManager'] Wrote uptime information
Followed the steps as per the KB > VMware KB: vmware-vpxd service fails to start in vCenter Server Appliance but could not able to resolve the issue.
The vCenter appliance is part of a domain. The AD domain is added as Identity source in SSO server. I do not see vCenter server listed, if I login with administrator@vsphere.local because vpxd fails to start.
Any help would be much appreciated.