It is impossible to login via AWI to the AE using a LDAP user, the JWP log contains the following error:
U00045014 Exception 'javax.naming.CommunicationException: "domain.com:636"' at 'com.sun.jndi.ldap.Connection.()'.
U00045015 The previous error was caused by 'java.security.cert.CertificateExpiredException: "NotAfter: Fri Jul 31 19:09:12 UTC 2020"' at 'sun.security.x509.CertificateValidity.valid()'.
U00045040 LDAP check with logon user 'DOMAIN\USER' failed.
Incorrect (expired) certificate had been imported into one of the LDAP servers for test reasons
Release : 12.x
Component : AUTOMATION ENGINE
In order to fix the issue, contact your System / LDAP Server Administrators and ask them to verify the Certificates validity and fix / update the expired certificate.
After having renewed this certificate the LDAP login will work fine again.