I've recently discovered that I cannot connect to my Oracle 10G XE database using the sysdba account.
I've looked through the discussion boards for answers to this problem, and have tried a few things but have not been successful. Admittedly, my Oracle system administration experience is very limited. I work primarily on the front-end: writing queries and creating apps in APEX.
SYSDBA is a role, so I assume you are referring to changing the SYS and SYSTEM passwords.
Use the command line to connect initially using "connect / as sysdba" and then execute the ALTER USER commands