I check the you mentioned but my case is different: When AUDIT_TRAIL is 'db' I receive the mentioned error "AUD: OS Error = 1717", but when I put this parameter with 'none' value the error is not register in the alert log file.
Any idea how it is succeded and how I can solve it?
enough space on system tablespace?
A 1717 means that your Windows event log is broken. Not Oracle's problem. Talk to your sys admin.
I have enough space on system tablespace.
Any other suggestion?