We have an old application running on Solaris using Oracle:DBD that happily connects to an Oracle 11g server! $DBD::Oracle::VERSION = '1.14'; When trying to connect to a new 12c server we're encountering ORA-28040: No matching authentication protocol (DBD ERROR: OCISessionBegin) Google implies that we need to change sqlnet.allowed_logon_version on the server, but our DBA tells us that's not possible on our new dataserver setup! So, question is...will a newer version of Oracle::DBD solve our issues, and if so, what version do we need? If not, any other ideas?