Oracle Database Discussions

Hi.

In Oracle 12.2.0.1.0, I can CONNECT / AS SYSDBA in SQL*Plus and say

ALTER USER  FOO IDENTIFIED BY FUBAR;

and it tells me "user altered", but when I try

CONN FOO/FUBAR

i get the error message "ORA-01017: invalid username/password; logon denied".

I used all capital letters in all the commands, and I've done

ALTER SYSTEM SET SEC_CASE_SENSITIVE_LOGIN=FALSE SCOPE=BOTH

anyway.

I get the same problem with other users (including newly created users), longer and more complicated passwords, and whether or not I explicitly use @SID.

What am I doing wrong?