I installed Oracle 8.1.7 on Windows 2000 and got this message when I tried to connect to my database from the client's PC:
ORA-12537 TNS:connection closed
Would you help me with this?

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Check the tnsnames.ora file on the client to determine whether the port defined for that database matches what is in the listener.ora file on the server, especially if the listener.ora defines more than one port for different protocols. For example, if the listener.ora file indicates port 1521 using TCP protocol, ensure that the client tnsnames.ora also uses port 1521 for that database so that a successful connection can be made between the client and server.

This was first published in November 2005

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