didip opened a new issue #11469:
URL: https://github.com/apache/druid/issues/11469
### Description
It is very difficult to debug LDAP errors because there's minimal logging.
For example:
```
2021-07-20T15:31:16,522 ERROR [qtp879829980-142]
org.apache.druid.security.basic.authentication.validator.LDAPCredentialsValidator
- Exception during user lookup
javax.naming.InvalidNameException: [LDAP: error code 34 - Invalid DN]
at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:3202)
~[?:1.8.0_292]
at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2993)
~[?:1.8.0_292]
```
It is very hard to figure out which part of the DN that is bad.
It would be much better if Druid logs more LDAP errors.
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