The vCenter Server authentication services use syslog for logging. You can examine the log files to determine the reasons for failures.
|VMware Directory Service|| By default, vmdir logging goes to /var/log/messages or /var/log/vmware/vmdird/.
For issues at deployment time, /var/log/vmware/vmdir/vmafdvmdirclient.log might also contain useful troubleshooting data.
|VMware Single Sign-On||vCenter Single Sign-On logging goes to /var/log/vmware/sso/.|
|VMWare Certificate Authority (VMCA)||VMCA service log is located in /var/log/vmware/vmcad/vmcad-syslog.log.|
|VMware Endpoint Certificate Store (VECS)||VECS service log is located in /var/log/vmware/vmafdd/vmafdd-syslog.log.|
|VMware Lookup Service||Lookup service log is located in /var/log/vmware/sso/lookupServer.log.|