ORA-24247: network access denied by access control list (ACL) in 12c

SQL> conn scott/tiger
Connected.
SQL> SELECT UTL_HTTP.request('https://wsctt.pearsonvue.com/cxfws2/services/Ping','http://www-proxy-abc.us.oracle.com:80','file:/u01/app/oracle/product/12.1.0/dbhome_2/owm/wsctt_102019','abcedef')FROM DUAL;
SELECT UTL_HTTP.request('https://wsctt.pearsonvue.com/cxfws2/services/Ping','http://www-proxy-abc.us.oracle.com:80','file:/u01/app/oracle/product/12.1.0/dbhome_2/owm/wsctt_102019','abcedef')FROM DUAL
       *
ERROR at line 1:
ORA-29273: HTTP request failed
ORA-24247: network access denied by access control list (ACL)
ORA-06512: at "SYS.UTL_HTTP", line 1491
ORA-06512: at line 1

SQL>

SQL> conn sys as sysdba
Enter password: 
Connected.
SQL> BEGIN
  DBMS_NETWORK_ACL_ADMIN.append_host_ace (
    host       => '*', 
    lower_port => 1,
    upper_port => 9999,
    ace        => xs$ace_type(privilege_list => xs$name_list('connect'),
                              principal_name => 'SCOTT',
                              principal_type => xs_acl.ptype_db)); 
END;
/
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PL/SQL procedure successfully completed.

SQL> 


SQL> conn scott/tiger
Connected.

SQL> SELECT UTL_HTTP.request('https://wsctt.pearsonvue.com/cxfws2/services/Ping','http://www-proxy-abc.us.oracle.com:80','file:/u01/app/oracle/product/12.1.0/dbhome_2/owm/wsctt_102019','abcedef')FROM DUAL;

UTL_HTTP.REQUEST('HTTPS://WSCTT.PEARSONVUE.COM/CXFWS2/SERVICES/PING','HTTP://WWW
--------------------------------------------------------------------------------
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:soapen
v="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><soap:Fault><soap:Code>
<soap:Value>soap:Receiver</soap:Value></soap:Code><soap:Reason><soap:Text xml:la
ng="en">Fault occurred while processing.</soap:Text></soap:Reason></soap:Fault><
/soap:Body></soap:Envelope>


SQL>

-- Access wallets in 11g

BEGIN
   DBMS_NETWORK_ACL_ADMIN.create_acl (
      acl           => 'wsctt_102019.xml',
      description   => 'ACL for scott user to access wsctt_102019 wallet',
      principal     => 'SCOTT',
      is_grant      => TRUE,
      privilege     => 'use-client-certificates',
      start_date    => NULL,
      end_date      => NULL);
   COMMIT;
END;
/

BEGIN
   DBMS_NETWORK_ACL_ADMIN.assign_wallet_acl (
      acl           => 'wsctt_102019.xml',
      wallet_path   => 'file:/u01/app/oracle/product/12.1.0/dbhome_2/owm/wsctt_102019');
   COMMIT;
END;

/