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ORA-12203 after installing 7.3

I've installed Oracle 7.3. I've also created a user named "sa". Then I configured "Oracle net easy configuration", but when I want to login with this user, I recieve "ORA-12203:TNS-Cannot connect to destination". I would be so thankful if you guide me in how I can solve this problem.

I'd first install Oracle 10g or at least Oracle 9i since Oracle 7.3 was released pre-1990 and has been desupported for about a decade now. I barely remember working on 7.3 databases, and if you're running any recent OS, 7.3 is probably not supported anyway, so there's a whole host of likely OS compatibility problems.

Check your tnsnames.ora file for the connect descriptor and also check to make sure that the listener is running on the server.


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