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TNS error when performing tnsping

I can ping the server on which my database is installed, but when I do tnsping <db_name> I get the following error: "TNS-12535: TNS:operation timed out."

I can ping the server on which the database is installed but when I do tnsping <db_name> I get the following error: "TNS-12535: TNS:operation timed out."
This error is usually associated with firewall issues or a slow network. If there is a firewall between the server and client, ensure that the port the listener is listening on is open. If there is no firewall and the network is slow, you may have to increase the value of the CONNECT_TIMEOUT parameter in the listener.ora. You can either set the value to zero, which means it will wait indefinitely, or you can set this to a higher value. Try a ping again and see what type of response you receive. You can use this information to set an appropriate CONNECT_TIMEOUT value in the listener.ora file on the database server.

You should also review the Oracle9i Release 2 (9.2) Net Services Administrator's Guide. Of particular interest to you might be the "Troubleshooting Oracle Net Services" section.

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