I had to use oracle UTL_HTTP to access HTTPS site. The site uses diacritical letters (öäüõ) in certificate organization name. This site was https://ariregister.rik.ee/ where subject was CN = *.rik.ee O = Registrite ja infosüsteemide Keskus L = Tallinn C = EE Typically I have added all certificates in path as trusted root certs into oracle wallet. In this case, there were three certificates on path: So I exported those as: *.rik.ee to arireg1.cer DigiCert SHA2 High Assurance Server CA to arireg2.cer DigiCert High Assurance EV Root CA to arireg3.cer And imported them to oracle wallet: orapki wallet add -wallet /u01/app/oracle/admin/MYSID/xdb_wallet/ -trusted_cert -cert "/tmp/arireg1.cer" -pwd XXXXXX orapki wallet add -wallet /u01/app/oracle/admin/MYSID/xdb_wallet/ -trusted_cert -cert "/tmp/arireg2.cer" -pwd XXXXXX orapki wallet add -wallet /u01/app/oracle/admin/MYSID/xdb_wallet/ -trusted_cert -cert "/tmp/arireg3.cer" -pwd XXXXXX Usi...