Need help for connection

Hello

I created the database using Oracle "Database configuration assistant tool" and I provided values such as

for password:Abc@123456
SID: testdb
Database name: testdb

and selection is still accepted as default value provided by the tool.

Now when I try to connect to the database using "sql developer" credentials that I use while creating a new connection is:

connection name: testdb
username: testdb
pasword:ABC@123456
HostName:localhost
Port: 1521 (Default)
SID: testdb

Lifted on test error: ORA - usename/password 01017:invalid: connection refused

Can someone help identify my incorrect steps:

Concerning
Beat

There is a gap b/w sqlplus and / as sysdba

sqlplus / as sysdba

C:\Users\niketk>sqlplus / as sysdba

SQL*Plus: Release 11.2.0.2.0 Production on Thu Jan 17 19:44:34 2013

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Express Edition Release 11.2.0.2.0 - Production

SQL> alter user hr identified by password account unlock;

User altered.

SQL> exit
Disconnected from Oracle Database 11g Express Edition Release 11.2.0.2.0 - Production

Tags: Database

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