![]() ![]() There was no acceptable authentication protocol for either client or server. I'll talk more about Oracle JDBC driver with ORA-28040 later in the post. Same error may occur while you're using old Oracle JDBC drivers, say ojdbc14.jar or below, to connect a 12c or 18c database. But I didn't expect ORA-28040 to show up.įor those users who want to use Oracle client 11g to connect to database 19c, but failed with ORA-28040, I'll talk about it in the last section. ![]() I knew there could be some interoperability problems between versions, especially when the version gap is big like this case, Oracle 9i client connect to 12c, 18c or 19c database. When I tried to connect to a 12.1 database from an Oracle client 9.2, it failed with ORA-28040: No matching authentication protocol. ORA-28040: No matching authentication protocol ![]()
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