Application Express :: How To Configure LDAP SSL Using Auto Login Wallet

I need to enable authentication over LDAP SSL. I've configured a wallet (auto login) containing required certificates and set accordingly WALLET_PATH and WALLET_PWD settings using apex_instance_admin.set_parameter method. With this, everything is working fine and LDAP over SSL is working well. It confirms that the wallet is properly configured, valid and usable.

So, the wallet was created with auto login option and it seems to work well without specifying password when calling utl_http.

Proof of properly configured auto login wallet (without password).
TEST01@DB11G> exec show_html_from_url('https://www.verisign.com/'); -- test without wallet
BEGIN show_html_from_url('https://www.verisign.com/'); END;

*
ERROR at line 1:
ORA-29273: HTTP request failed
ORA-06512: at "SYS.UTL_HTTP", line 1527
ORA-29261: bad argument
ORA-06512: at "TEST01.SHOW_HTML_FROM_URL", line 25
ORA-29273: HTTP request failed
ORA-06512: at "SYS.UTL_HTTP", line 1130
ORA-29024: Certificate validation failure
ORA-06512: at line 1TEST01@DB11G> exec utl_http.set_wallet('file:/u01/app/oracle/product/11.2.0/dbhome_1/network/admin'); -- set wallet info for use without password (autologin)

PL/SQL procedure successfully completed.

TEST01@DB11G> exec show_html_from_url('https://www.verisign.com/'); -- It works!

PL/SQL procedure successfully completed. So, when I configure WALLET_PATH without WALLET_PWD, it not seems to work as it should with my auto login wallet...

Is it APEX not handling auto login wallets correctly?

Apex Version: 4.2.0.00.27
OS: OEL 6.4
DB: 11.2.0.3 x64