While enabling or activating the DBMS Debugger feature through Toad for Oracle in an Oracle 19c RAC database environment, the following error was returned:
ORA-28759: failure to open file
The issue was related to an SSL/TLS certificate problem in the Oracle RAC environment.
ORA-28759 commonly indicates that Oracle could not access or validate a required wallet or SSL-related file. In this case, the existing SSL certificate configuration was invalid, outdated, or inaccessible, causing the debugger activation process to fail.
The issue was resolved by installing and configuring a new SSL certificate in the Oracle RAC environment.
After the certificate replacement:
SSL communication was successfully re-established.
The DBMS Debugger activation completed successfully.
No further ORA-28759 errors were reported.