Thanks Jared (and to Thomas Day also) for the suggestion. I've copied over the tnsnames.ora file, (and also the listener.ora and sqlnet.ora files for good measure) to the 9.2 network\admin directory, bounced everything and tried again, but with exactly the same result. Obviously I'm missing something really obvious, but my brain's just seized up on this one. Any further ideas would be REALLY welcome! In case it helps, here's the essential information: Services running are the 8.0.6 listener, and the 8.0.6 database instance services. The Global Name, db_name and db_domain of the database are DLIB.WORLD, dlib and WORLD respectively. When I run the 9.2 database upgrade assistant it lists: "Oracle SID: DLIB, OracleHome: d:\oracle\ora80". The message when I try to proceed is "ORA-12203: TNS: unable to connect to destination". The tnsnames.ora file (which I've now copied to the 9.2 network\admin directory) contains: # D:\ORACLE\ORA80\NET80\ADMIN\TNSNAMES.ORA Configuration File:d:\oracle\ora80\net80\admin\tnsnames.ora # Generated by Oracle Net8 Assistant DLIB.WORLD = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = diglib3)(PORT = 1521)) (CONNECT_DATA = (SID = dlib)) ) EXTPROC_CONNECTION_DATA.WORLD = (DESCRIPTION = (ADDRESS = (PROTOCOL = IPC)(Key = EXTPROC0)) (CONNECT_DATA = (SID = extproc)) ) The listener.ora file (also copied over to 9.2 directory) contains: # D:\ORACLE\ORA80\NET80\ADMIN\LISTENER.ORA Configuration File:d:\oracle\ora80\net80\admin\listener.ora # Generated by Oracle Net8 Assistant PASSWORDS_LISTENER= (oracle) LISTENER = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = IPC)(KEY = oracle.world)) (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0)) (ADDRESS = (PROTOCOL = NMP)(SERVER = DIGLIB3)(PIPE = ORAPIPE)) (ADDRESS = (PROTOCOL = TCP)(HOST = DIGLIB3)(PORT = 1521)) ) SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (SID_NAME = extproc) (PROGRAM = extproc) ) (SID_DESC = (GLOBAL_DBNAME = DIGLIB3) (ORACLE_HOME = d:\oracle\ora80) (SID_NAME = dlib) ) ) The sqlnet.ora file (also copied over) contains: # D:\ORACLE\ORA80\NET80\ADMIN\SQLNET.ORA Configuration File:d:\oracle\ora80\net80\admin\sqlnet.ora # Generated by Oracle Net8 Assistant NAME.DEFAULT_ZONE = world NAMES.DEFAULT_DOMAIN = world #sqlnet.authentication_services = (NONE) SQLNET.EXPIRE_TIME = 0 SQLNET.ENCRYPTION_SERVER = requested SQLNET.ENCRYPTION_CLIENT = requested NAMES.DIRECTORY_PATH= (TNSNAMES, HOSTNAME) I hope someone can see the obvious mistakes here - they're not obvious to me (he says, feeling very, very dim!) Best regards, Paul Paul Vincent Database Administrator University of Central England -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Jared.Still@xxxxxxxxxxx Sent: 17 June 2004 17:26 To: oracle-l@xxxxxxxxxxxxx Subject: Re: Problem upgrading from Windows 2000 Oracle 8.0.6 to Oracle 9.2.0.1.0 You likely need to investigate the 9.2 tnsnames.ora file. It probably needs to be modified to include the 8.0.6 database information. The DBCA is getting the info from the registry, but that doesn't help you with creating a database connection. Jared "Paul Vincent" <Paul.Vincent@xxxxxxxxx> Sent by: oracle-l-bounce@xxxxxxxxxxxxx 06/17/2004 07:37 AM Please respond to oracle-l@xxxxxxxxxxxxx To <oracle-l@xxxxxxxxxxxxx> cc Subject Problem upgrading from Windows 2000 Oracle 8.0.6 to Oracle 9.2.0.1.0 Hi everybody, I've just installed Oracle 9.2.0.1.0 onto a Windows 2000 server which was currently running Oracle 8.0.6 with a single instance on it. I noticed that during the installation, I wasn't presented with the Upgrading An Existing Database screen. This may be significant! I didn't think anything of it, since I intended to run the Database Upgrade Assistant independently after installing 9.2. The installation went smoothly. I then checked that the 8.0.6 db instance was still up and running, by connecting to it from my office workstation. Yes, fine. Back to the server, and I fired up Database Upgrade Assistant from the Oracle 9.2 program group. After the Welcome screen it showed the panel which did indeed list my 8.0.6 database. I selected it, gave a userid with the necessary SYSDBA privileges, and a password, and clicked on next. Then I got an error message: ORA-12203: TNS unable to connect to destination. Now, presumably this means I've got something wrongly configured on the server, such that it can't connect to its own local database. Any ideas at all, as to where I should start looking, would be very greatly appreciated! Best regards, Paul Vincent Database Administrator University of Central England ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------