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copied!<p>You have to do below mentioned check list for solve this issue.</p> <ul> <li><p>If you are using local naming (TNSNAMES.ORA file):</p></li> <li><p>Make sure that "TNSNAMES" is listed as one of the values of the NAMES.DIRECTORY_PATH parameter in the Oracle Net profile (SQLNET.ORA)</p></li> <li><p>Verify that a TNSNAMES.ORA file exists and is in the proper directory and is accessible.</p></li> <li><p>Check that the net service name used as the connect identifier exists in the TNSNAMES.ORA file.</p></li> <li><p>Make sure there are no syntax errors anywhere in the TNSNAMES.ORA file. Look for unmatched parentheses or stray characters. Errors in a TNSNAMES.ORA file may make it unusable.</p></li> <li><p>If you are using directory naming:</p></li> <li><p>Verify that "LDAP" is listed as one of the values of the NAMES.DIRETORY_PATH parameter in the Oracle Net profile (SQLNET.ORA).</p></li> <li><p>Verify that the LDAP directory server is up and that it is accessible.</p></li> <li><p>Verify that the net service name or database name used as the connect identifier is configured in the directory.</p></li> <li><p>Verify that the default context being used is correct by specifying a fully qualified net service name or a full LDAP DN as the connect identifier</p></li> <li><p>If you are using easy connect naming:</p></li> <li><p>Verify that "EZCONNECT" is listed as one of the values of the NAMES.DIRETORY_PATH parameter in the Oracle Net profile (SQLNET.ORA).</p></li> <li><p>Make sure the host, port and service name specified are correct.</p></li> <li><p>Try enclosing the connect identifier in quote marks. See the Oracle Net Services Administrators Guide or the Oracle operating system specific guide for more information on naming.</p></li> </ul> <p>For more information check <a href="http://docs.oracle.com/cd/B19306_01/network.102/b14212/toc.htm" rel="nofollow"> <strong>Oracle® Database Net Services Administrator's Guide</strong></a> under "Oracle Net Connections"</p> <p>I hope this will help to you.</p>

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