sqlplus remote connection giving ORA-21561

I have installed sqlplus based on instruction given here

sqlplus 'username/password@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.0.100)(PORT=1521))(CONNECT_DATA=(SID=ORCL)))'

This is giving me error

SQL*Plus: Release 11.2.0.4.0 Production on Fri Jul 10 16:10:38 2015

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

ERROR:
ORA-21561: OID generation failed


Enter user-name:

What is the solution for this problem?

PS: I have already added hostname and hosts have already have value.

Prasanth Pennepalli

Append the name of your server to the hosts file.

If your /etc/hosts file looks like this:

127.0.0.1   localhost localhost.localdomain

It should be changed to:

127.0.0.1   localhost localhost.localdomain hostname

hostname can be obtained from the command "hostname".

If you are using Mac add local computer name to your 127.0.0.1 in /etc/hosts

It will be like

127.0.0.1       localhost <local_computer_name>

Way to find local computer name

System Preferences>Sharing(search for it if you cant find) on the top you can see your local computer name

or you can use "hostname" command to get local computer name

Geraldo Milagre

This issue can also be cause by wrong permissions on the /etc/hosts file. If it is not readable for the Oracle uid, the errors will show.

Make sure your /etc/hosts is readable by everybody:

$ ls -l /etc/hosts
-rw-r--r--    1 root     system        7446 Mar 28 23:03 /etc/hosts 
$

Answer obtained here.

1 - Get your hostname:

$ hostname

new-host

2 - Change the contents of /etc/hosts:

$ sudo cat /etc/hosts

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

$ sudo nano /etc/hosts

$ sudo cat /etc/hosts

127.0.0.1 localhost new-host

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

Hope this helps (:

look at /etc/sysconfig/network change if needed the hostname

try this, don't put single quotes

sqlplus username/password@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.0.100)(PORT=1521))(CONNECT_DATA=(SID=ORCL)))

来源：https://stackoverflow.com/questions/31338916/sqlplus-remote-connection-giving-ora-21561

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