javax.security.auth.login.FailedLoginException: [Security:090303]Authentication Failed: User weblogic weblogic.security.providers.authentication.LDAPAtnDelegateException: [Security:090295]

If you are receiving this error then you probably have an External Authentication Provider set to REQUIRED in Weblogic > Server Security Realm

to fix this:

1. SSH into the Machine
2. CD to the Admin server directory eg. /u01/app/oracle/admin/<DOMAIN>/aserver/<DOMAIN>/
3. nano /config/config.xml
4. search for <sec:control-flag>REQUIRED</sec:control-flag> near the top of the XML
5. Check that the <sec:name>ActiveDirectoryAuthenticator</sec:name> matches the name of one of your Providers
6. Change the value to "SUFFICIENT"

Try running ./startWebLogic.sh again