We could see that below errors are coming in adminui server.log during the startup. We are using external administration in our environment and LDAP is the external store.
2017-02-11 13:54:12,725 ERROR [ims.llsdk.directory.jndi] (MSC service thread 1-1) VLV Controls not functional: javax.naming.NamingException: LDAP response read timed out, timeout used:-1ms.; remaining name 'o=xyz'
at com.sun.jndi.ldap.Connection.readReply(Connection.java:478) [rt.jar:1.8.0_31]
2017-02-11 13:54:27,756 ERROR [stderr] (MSC service thread 1-1) javax.naming.NamingException: JBAS011843: Failed instantiate InitialContextFactory com.sun.jndi.ldap.LdapCtxFactory from classloader ModuleClassLoader for Module "deployment.iam_siteminder.ear.user_console.war:main" from Service Module Loader [Root exception is javax.naming.NamingException: LDAP response read timed out, timeout used:-1ms.]
Also sometimes we get these errors during Configure Administrative Authentication, we cannot set up the Super User ID as the Wizard can not find administrative user.