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Resolving the ORA-12505 TNS error

The database SID name, host and port have been added to the listener. However, I can't connect to the database, and there is an error displaying (ORA-12505 TNS Could not resolve SID given in connect descriptor), although when I use tnsping80 it works with me!! The other users can connect, but I can't connect, and even my neighbor can't ping it!! Do you think the problem from the sub network???? Thanks in advance.

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tnsping doesn't prove that you can connect. Your SID or SERVICE it probably wrong in the tnsnames entry. tnsping only shows that "there is a listener on that port". It does not show that "the database you want that listener to hook you up with exists and is up"

Check your tnsnames.ora file ($ORACLE_HOME/network/admin) and make sure you have all the entries correct.

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This was first published in December 2002

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