Cannot connect to db using toad

Question

hi ,
I get the following error while I try to connect my db using toad and windows sql
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Fatal OSN connect error 12203, connecting to:
(DESCRIPTION=(CONNECT_DATA=(SID=INS)(CID=(PROGRAM=TOAD.exe)(HOST=Windows NT PC)(USER=altaf)))(ADDRESS_LIST=(ADDRESS=(PROTOCOL=ipc)(KEY=INS.WORLD))(ADDRESS=(COMMUNITY=tcp.world)(PROTOCOL=TCP)(Host=10.15.44.11)(Port=1521))(ADDRESS=(COMMUNITY=tcp.world)(PROTOCOL=TCP)(Host=10.15.44.11)(Port=1526))))
VERSION INFORMATION:
TNS for 32-bit Windows: Version 2.3.2.1.0 - Production
Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 2.3.2.1.3 - Production
Time: 03-JUL-08 12:36:22
Tracing not turned on.
Tns error struct:
nr err code: 12203
TNS-12203: TNS:unable to connect to destination
ns main err code: 12535
TNS-12535: TNS:operation timed out
ns secondary err code: 12560
nt main err code: 505
TNS-00505: Operation timed out
nt secondary err code: 60
nt OS err code: 0
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but the same db is connecting using froms 4.5
may be some settings in the tnsnames or sqlnet.ora files got changed
please advise urgently
also can u guide me to some document detailing the significance of these two files
Altaf

Answer 1

Hi
When trying to connect to Oracle the following error is generated:
ORA-12203: unable to connect to destination
Possible Causes and Remedies:
Invalid TNS address supplied.
Verify that the service name is correct.
Verify that the name of the ‘host’ computer (defined as part of the TNS address) is valid and correct.
Destination not listening.
Ensure that the listener is running at the remove node. This can be verified on the server by using the command ‘lsnrctl80 status’ and also by looking at the services and checking that the service ‘OracleService<Sid>’ is running.
If the listener service is not running, does not exist and the database has just been created anew on the machine by restoring it from a backup, then the listener service will need to be created:
Oradim80 –new –sid <SID> -intpwd Oracle –startmode AUTO –pfile <full-path-of-init-file>
This should only be done in the circumstances outlined above.
Possibly because of underlying network transport problems.
Check that the remote node is visible on the network.
To gain more information in diagnosing the problem, enable tracking on the client, try making the connection again and then look at the trace file SQLNET.LOG.
There are multiple databases on the server and the database alias was not supplied as part of the connection string. This will only arise if connecting to the database on the same machine, since normally in this instance the database alias is optional if there is only one instance. Try:
Setting the environment variable ‘ORACLE_SID’ to the SID of the desired instance. (Consider setting ORACLE_SID in the registry.)
Explicitly specifying a database alias when connecting to the database.
Setting the environment variable ‘LOCAL’ or ‘REMOTE’ to the SID of the desired database. The service name does not then need to be specified.
Note: Using the utility ‘TNSPING’ may help in identifying any problems. As well as identifying whether a successful connection can be made, it also indicates whether the TNS name supplied is valid and if so then the host computer that it is trying to connect to. Syntax:
TNSPING <tns-name>