I just installed Oracle 11g into my machine. I was about to shut down a database instance, and Oracle asked me for username and password, I provided the credentials I used to login into the web system, and it said that the credentials were wrong.
I googled how to change credentials, so I logged in into SQL Plus and did the following:
ALTER USER sys IDENTIFIED BY "my_new_password";
then I tried to shut down the database instance logging in with the user
sys and the new password and oracle still complaint about wrong credentials. Then I logged off, and when I tried to log in with my username and password they didn't work. I tried to login with sys and the new password and it didn't work, and now I completely out of the database management web site, and I can't do anything.
I do not know where to go from here, I'm working in a Windows 7 Machine.