connect oracle forms 6i with oracle19c database
We have a big system developed by oracle forms 6i (6.0.8.24), We were working on oracle database 11g and everything was stable and working well , the database server is facing some performance issues, we decided to make new server for database we installed oracle 19c on oracle linux7 but after successfully installation of database, while we was trying to connect the client ( oracle forms 6i) to oracle19c , we got ORA-28040: No matching authentication protocol, what is the problem
all my business built on oracle forms6i (sure we'll upgrade but not now) , Please I urgent need your help because our business will stop and we are a very old customer of you.