ORA-12532: TNS:invalid argument

sqlplus system@orcl

SQL*Plus: Release 11.1.0.6.0 - Production on Sun Aug 19 13:18:56 2007

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Enter password:
ERROR:
ORA-12532: TNS:invalid argument

In this case we can ping to remote host but not able to connect database which we have created on remote host.

Cause : Listener port is closed.May be a firewall policy make the issue.

Action : We need to open Listener port for communication .By default Listener port is 1521.

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