Can't create connection in SQL developer

Question

hi,
i download sql developer from oracle website but when i want to start and start it with making new connection it always give me error saying
test faild IO error: the network adapter could not estabilished a connection
please help
i am using windows vista 32bit OS

Answer 1

Hi Saqid,
If you performed a default Oracle 10g Express Edition installation on your local machine, then you should find something like the following:
Services:
OracleXEService Started Automatic
OracleXETNSListener Started Automatic
TNSNAMES.ORA file entry:
XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
You should be able to do the following from a Windows command prompt and get similar results:
C:\>sqlplus /nolog
SQL*Plus: Release 10.2.0.1.0 - Production on Mon Jul 25 14:53:17 2011
Copyright (c) 1982, 2005, Oracle. All rights reserved.
SQL> conn system
Enter password:
Connected.
SQL>
SQL> quit
Disconnected from Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
C:\>
C:\>tnsping xe
TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 25-JUL-2011 14:22:35
Copyright (c) 1997, 2005, Oracle. All rights reserved.
Used parameter files:
C:\oraclexe\app\oracle\product\10.2.0\server\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)
(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = XE)))
OK (50 msec)
When your installation works correctly for these commands, then the SQL Developer connection should work as well.  If not, please provide specific installation and machine details.  But first you need to verify using sqlplus and tnsping that the 10g installation is working correctly.  If not, then please post to the appropriate forum for help in that area.
Regards,
Gary Graham
SQL Developer Team