Cannot login to admin console

I’‘ve just installed jive 2.2.2 on RedHat 9.0, Oracle 9.2. First I couldn’‘t change default admin password, but I’‘ve skipped this step. Now I want to log on to console using auth pair admin/admin, but I receive error: "Login failed, make sure your username and password are correct and that you’‘re an admin or moderator". I’‘ve checked username and password in jive user table and found that this pair exists. I’'m not using LDAP authentication. Please help

I was logged on in sqlplus as jive. When I logged off - suddenly console has put me through. Strange, isn’'t it?