apache/hadoop · error · AuthenticationException

Error validating LDAP user

Error message

Error validating LDAP user

What it means

Error "Error validating LDAP user" thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/server/LdapAuthenticationHandler.java:282

          public boolean verify(String hostname, SSLSession session) {
            return true;
          }
        });
      }

      tls.negotiate();

      // Initialize security credentials & perform read operation for
      // verification.
      ctx.addToEnvironment(Context.SECURITY_AUTHENTICATION,
          SECURITY_AUTHENTICATION);
      ctx.addToEnvironment(Context.SECURITY_PRINCIPAL, userDN);
      ctx.addToEnvironment(Context.SECURITY_CREDENTIALS, password);
      ctx.lookup(userDN);
      logger.debug("Authentication successful for {}", userDN);

    } catch (NamingException | IOException ex) {
      throw new AuthenticationException("Error validating LDAP user", ex);
    } finally {
      if (ctx != null) {
        try {
          ctx.close();
        } catch (NamingException e) { /* Ignore. */
        }
      }
    }
  }

  private void authenticateWithoutTlsExtension(String userDN, String password)
      throws AuthenticationException {
    Hashtable<String, Object> env = new Hashtable<String, Object>();
    env.put(Context.INITIAL_CONTEXT_FACTORY,
        "com.sun.jndi.ldap.LdapCtxFactory");
    env.put(Context.PROVIDER_URL, providerUrl);
    env.put(Context.SECURITY_AUTHENTICATION, SECURITY_AUTHENTICATION);
    env.put(Context.SECURITY_PRINCIPAL, userDN);

View on GitHub (pinned to 2add963021)

Solutions

1. Check the LDAP bind credentials and connectivity; the wrapped exception carries the directory server's reason.

Example fix

Verify user DN pattern and password against the LDAP server.

When it happens

Trigger: Raised at runtime when the documented precondition or configuration requirement for this operation is violated.

Common situations: Misconfigured or missing property, invalid user input, or calling the API before its prerequisites are met.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/4a88a9720a27fbe9. Report an issue: GitHub.