I've installed xampp x64 v5.6.14-0 on Centos 7.1 x64, and moved "/opt/lampp/htdocs" to "/var/www/html" and after "lampp security" I got login error at phpmyadmin as shown at attached photo.

Any helpful comment would be appreciated.
Thanks in advance.

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Have you been to https://www.phpmyadmin.net/docs/ ?

See also http://wiki.phpmyadmin.net/pma/Auth_types

1 members found this post helpful.

Habitual/

Yes I am studying now. I tried cookie, http, and config, but could not make it.

Even I could not understand what's problem.

Also, have a look at /var/log/apache2/error.log...?

It is usually quite explicit.
Have you tried a non-root user?

It is possible that the security script for mysql install was run and root@localhost permissions have been removed...

1 members found this post helpful.

Habitual/

I logged in user and tried to browse "http://localhost/phpmyadmin", then opened.

Thanks a lot.

And if "the security script for mysql install" problem exists, how to fix it?

Having the script doesn't mean it hasn't been run.
Running it secures the mysql installation and removes the test database
and the anonymous privileges, and root@% privileges also in the mysql.user table.

When I said I meant that running the script removes the "root@%" privilege, is all.

You should be able to login to phpmyadmin as root (since it would be root@localhost) to the mysql-server/host.

the root password for that is the mysql_root user and not root for the system.
mysql_root user password can be reset quite easily by the root user of the system.

This does not ensure that mysql_root can login to phpmyadmin however.
A security feature in phpmyadmin may be preventing that.

Logging in to phpmyadmin as "root" is the mysql_root user.
root to mysql and root to the system are 2 separate identities.