I'm trying to upgrade my Oracle database from 22.214.171.124.2 to 126.96.36.199.2.
The new database software has been installed in a new Oracle home (D:\Oracle\TST\920).
Now, I want to start the upgrade process using the Database Upgrade Assistant. When I start this assistant, I have to choose the database to upgrade. It shows my "old" database "8.1.7 - D:\Oracle\TST\817". I select this database and choose next. The program says it's "getting database information", and then immediatley gives an "ORA-12560: TNS: protocol adapter error".
The listener for 920 has been started. "lsnrctl status" is succesfull, as well as "tnsping TST". The database is up and running and I can connect to it using sqlplus (I performed a select on a database table to check wether the connection really worked).
What is going on here and how can I resume my upgrade project?