Best practice and workaround see below article;

http://community.spiceworks.com/help/Resolving_Unknown_Devices#Domain

1. From bottom status bar, click Start > Run and put " firefox.exe -safe-mode "

Here is the Firefox 3.6 memory usage before changes by Taskmgr. As you can see Firefox is taking 252M. Let's see how much we can reduce Firefix high memory usage after modification.

While we were researching a solution, we found below Free utilites and it works.

• AlternaTIFF:  http://www.alternatiff.com/ (tested: IE, Netscape, Opera)
• interneTIFF:  http://www.internetiff.com/ (tested: IE, Netscape)

"Error:the xml response that was returned from the server is invalid"

Resolution was simple and actually my previous job(?) was caused the above errors.

If you have created or copied a configuration.php file from configuration.php file-dist due to warning message in beginning of installation page. We did to correct the warning sign.

"Just remove 'configuraion.php' file, and just ignore the warning message"

Just remove 'configuraion.php' file, and just ignore the warning message. Now you won't see the 'Error:the xml response that was returned from the server is invalid' again.

A. Let's assume you have installed CentOS 5.

B. Check SSH demon that is pre-installed is running properly. Of course you can use telnet, but better not to. Create a account to acces CentOS from remote. You don't want to us root account to access the server, even this is testing server.

C. Review what components need to be installed.

PHP 5.2
MySQL 5.1
Apache 2.2

Reference; http://www.joomla.org/technical-requirements.html

D. Install Apaches, If you already installed httpd while installing CentOS as server package, you can skip this.

CentOS5_Joomla# yum --install httpd
CentOS5_Joomla# /etc/init.d httpd start ; To start web server
CentOS5_Joomla# /etc/init.d httpd restart ; To restart web server
CentOS5_Joomla# /etc/init.d httpd reload ; To reload web server

E. Install or upgrade PHP(CentOS comes with PHP Version 5.1.6)

Create file at /etc/yum.repos.d/upgrade-php.repo and copy below statement

"[c5-testing]
  name=CentOS-5 Testing
  baseurl=http://dev.centos.org/centos/$releasever/testing/$basearch/
  enabled=1
  gpgcheck=1
  gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing
  includepkgs=php*
"
 

CentOS5_Joomla# yum update ; type "Y" on following prompt.
CentOS5_Joomla# /etc/init.d httpd restart ; you must restart httpd with any php or mysql changes
CentOS5_Joomla# php -v ; to verify

Reference; http://wiki.centos.org/HowTos/PHP_5.1_To_5.2

F. install or upgrade MySQL

CentOS5_Joomla# mysql --version ; To verify current verison
CentOS5_Joomla# which mysql ; to see where mysql is installed

1. Remove MySQL if you get error

"ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)"

CentOS5_Joomla# yum list | grep MySQL or mysql ; to see list of MySQL packages

CentOS5_Joomla# yum erase mysql
CentOS5_Joomla# yum erase mysql-5.0.77-4.el5_4.1.x86_64
:

:

2. Install MySQL

CentOS5_Joomla# yum install mysql-server
CentOS5_Joomla# yum install php-mysql
CentOS5_Joomla# yum install php php-pear

CentOS5_Joomla# /sbin/chkconfig --levels 235 mysqld on

CentOS5_Joomla# /etc/init.d/mysqld start ; If you get error, install mysql again.

4. Remove default setup and security review

CentOS5_Joomla# /usr/bin/mysql_secure_installation

You could setup MySQL root password during dialogue prompt.

To manual setup,

CentOS5_Joomla# mysqladmin -u root password mysqldata

5. To access MySQL server. Type:

CentOS5_Joomla# mysql -u root -p ; p option for password input

Once MySQL client is running, you should get the mysql> prompt.
Type the following at this prompt to see

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
+--------------------+
2 rows in set (0.00 sec)

mysql>

6. Create the joomla database

mysql> create database joomla_db;
Query OK, 1 row affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| joomla_db          |
| mysql              |
+--------------------+
3 rows in set (0.00 sec)

7. permission changes

The database is created by the root and so will not be accessible to
any other user unless permitted by the root. Thus, in order to use
this database from my account (ex, admin), I have to set the permissions by issuing the following command:

mysql> GRANT ALL ON joomla_db.* TO admin@localhost IDENTIFIED BY "password" \g
Query OK, 0 rows affected (0.00 sec)

Referenece; http://forums.mysql.com/read.php?11,153632
http://www.debuntu.org/how-to-create-a-mysql-database-and-set-privileges-to-a-user
http://www.webdevelopersnotes.com/tutorials/sql/mysql_primer_creating_a_database.php3

G. Upload Joomla package to CentOS servier. and extract it under /var/www/html/

H. Unzip the package

I. Open a broswer and http://localhost, then you should see Joom installation page.

http://localhost

J. Troubleshooting.

- No MySQL connection indication during Joomla installation.  You need to install php-mysql package or resintall that.

-If you got "Error: the XML response that was returned from the server is invild" message, see article " Joomla Error:the xml response that was returned from the server is invalid "

You can download sample from below URL.

http://code.google.com/p/vcastr/

Well, it doesn't provide a lot instructions, but no hassle to make it running.

Here is simple steps.

1. Download example.zip package

2. Extract sample package (example.zip)

3. You need only vcastr3.swf file. However, if you want show your domain name, you need logoPlugIn.swf file as well. 

4. Upload vcastr3.swf file to your webserver. For the testing purpose, you might upload vcastr3.html as well. uploading files are 

vcastr3.html
vcastr3.swf
logoPlugIn.swf 

5. For the testing from your browser

http://your domain.com /vcastr3.html

6. If you have html file on different directory, you need to make sure the path to those files are correct ( vcastr3.swf ). 

Access your service (hosting) and find head.php file in path  /libraries/joomla/document/html/renderer. Just remove below code

[ Joomla 1.0x Version ]

Access your server (hosting server) and find /includes/frontend.php

comment it out with "//" in line 195

Go to table manager and find database named a_tn2_kkkbodyonly_list, then open it. 

Find 'tbody' field and change field type from 'text' to mediumtext'. 

That's it.

While we was installing few module and plugins, we got below error message. Why?

Fatal error: Call to undefined method stdClass::onAuthenticate() in /home/iqng/public_html/libraries/joomla/user/authentication.php on line 121

Ended up found the reason that was somehow whole plugin folder was deleted. How?

Well, to recover this issue we downloaded latest Joomla distro and upload plugin portion of files. 

After that, no more errors, but origin login / password is not working. Tried admin password recovery thru phpadmin DB tools.