After upgrading my AWS RDS instance from Oracle 11g Oracle 19c, my DB Link stopped working with a certificate error. Uh-oh. The symptoms of the problem that I encountered are best summed up by this SQL*Plus snippet: SQL> select * from dual@test1; select * from dual@test1 * ERROR at line 1: ORA-29024: Certificate validation failure A bit of context: The above is testing an Oracle Database Link “test1” which was created using the TCPS protocol (i.
