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arizona9952 wrote:ORA-12514 ALWAYS only occurs due to a problem on DB Server system.
I recently installed Oracle database 11g XE onto my home computer running Windows 32 bit, but I can't connect to the database. I also have Oracle 10g R2 installed on my computer, and I can still connect to it finely. When trying to make a connection in SQL DEVELOPER, I get this error
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
One cause of this problem is when the Oracle database is down & needs to be started.
A remote client send a request to the Listener asking to be connected to a specific service.
If/when the listener does not know anything about that service, the listener responds with ORA-12514
post results from the following two OS commands:
Since every connection request to the listener gets logged, listener.log file will contain a line with 12514 as status code.
This line contains valuable debugging details. So post this line & surrounding lines.
for additional debugging suggestions read the URL below: