Actually I working in a project to upgrade certificates to new versions, perfoming a test I received the next error stack;
ORA-29273: fallo de la solicitud HTTP ORA-06512: en "SYS.UTL_HTTP", línea 1722 ORA-28857: Error SSL desconocido ORA-06512: en línea 1
After of review doc I discovered that engine database version (11.2.0.1) not support cerfiticates with SHA-2 algorithm because of this I have only two options, upgrade database to 11.2.0.3 (minimal release support SHA-2) or continue using SHA-1.
HTH – Antonio NAVARRO
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