The server is asking for your user name and password. The server reports that it is from XDB.

• Verify whether local_listener parameter is set,
  If not set this parameter and register.

• Make sure DB user ANONYMOUS account is unlocked.
• Enable enable anonymous access to the XML DB repository 

CONN sys/password AS SYSDBA

SET SERVEROUTPUT ON
DECLARE
l_configxml XMLTYPE;
l_value VARCHAR2(5) := ‘true’; — (true/false)
BEGIN
l_configxml := DBMS_XDB.cfg_get();
IF l_configxml.existsNode(‘/xdbconfig/sysconfig/protocolconfig/httpconfig/allow-repository-anonymous-access’) = 0 THEN
— Add missing element.
SELECT insertChildXML
(
l_configxml,
‘/xdbconfig/sysconfig/protocolconfig/httpconfig’,
‘allow-repository-anonymous-access’,
XMLType(” ||
l_value ||
”),
‘xmlns=”http://xmlns.oracle.com/xdb/xdbconfig.xsd”‘
)
INTO l_configxml
FROM dual;
DBMS_OUTPUT.put_line(‘Element inserted.’);
ELSE
— Update existing element.
SELECT updateXML
(
DBMS_XDB.cfg_get(),
‘/xdbconfig/sysconfig/protocolconfig/httpconfig/allow-repository-anonymous-access/text()’,
l_value,
‘xmlns=”http://xmlns.oracle.com/xdb/xdbconfig.xsd”‘
)
INTO l_configxml
FROM dual;
DBMS_OUTPUT.put_line(‘Element updated.’);
END IF;
DBMS_XDB.cfg_update(l_configxml);
DBMS_XDB.cfg_refresh;
END;
/