UTL_HTTP.set_wallet & Oracle Wallet & ORA-28759

Hi to all!

I am trying to connect over https using UTL_HTTP Package, but unsuccessful... It throws up this ORA error:

ORA-28759: failure to open file

Code snip:
...

UTL_HTTP.set_wallet('file:/home/oracle/wallets','oraw4lL3t');
...

sqlnet.ora contains following entry:

WALLET_LOCATION =
 (SOURCE =
  (METHOD = FILE)
   (METHOD_DATA = (DIRECTORY = /home/oracle/wallets))  )

Database is 10g on IBM AIX.

What coul'd be the reason for this error and how can I resolve this problem?

All help appreciated.

-- 
Dejan Topalovic "StRiPy"