我嘗試通過 LDAP 授權用戶。public Authentication authenticate(Authentication auth) throws AuthenticationException {        String username = getUserNameFromAuth(auth);        String password = auth.getCredentials().toString();        HelpDescUser userDetails = (HelpDescUser) userDetailsService.loadUserByUsername(username);        String email = userDetails.getEmail();        String url = "ldap://" + ldapHost + ":" + port + "/";        ActiveDirectoryLdapAuthenticationProvider ldapProvider =                    new ActiveDirectoryLdapAuthenticationProvider(null, url, rootDn);        ldapProvider.setSearchFilter(filter);        Authentication authenticate = ldapProvider.authenticate(new UsernamePasswordAuthenticationToken(email, password));        if (authenticate.isAuthenticated()) {            return new UsernamePasswordAuthenticationToken(userDetails, password, userDetails.getAuthorities());        }}我收到這個：引起：javax.naming.ServiceUnavailableException：okmarket.ru:636；套接字在 java.naming/com.sun.jndi.ldap.Connection.readReply(Connection.java:426) 在 java.naming/com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:365) 在 java 關閉.naming/com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:214) 在 java.naming/com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2795) 在 java.naming/com .sun.jndi.ldap.LdapCtx.(LdapCtx.java:320) 在 java.naming/com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:192) 在 java.naming/com.sun.jndi。 ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:210) 在 java.naming/com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:153) 在 java.naming/com.sun.jndi.ldap.LdapCtxFactory。 java 中的 getInitialContext(LdapCtxFactory.java:83)。怎么了？是我這邊的問題，還是 LDAP 那邊的問題？