sqlplus remote connection giving ORA-21561

Question

I have installed sqlplus based on instruction given here

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


        

Answer 1

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".