Monday, December 26, 2011

How to disable Autoconfiguration IPv4 Address

Sometime you setup windows server 2008 to vmware using LAN or wifi, you chose Bridge mode to share internet connections between host and virtual machine may be cause of issues with internet connection at virtual machine. They can not connect to the internet or appear a message likes "conflict IP address"

Enter: Run > cmd > ipconfig /all

You may see the following issues:


Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) 82567LM-3 Gigabit Network Connection
Physical Address. . . . . . . . . : 00-23-24-08-30-57
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::8508:6cb9:5112:f8c9 (Preferred)
Autoconfiguration IPv4 Address. . :
Subnet Mask . . . . . . . . . . . :

IPv4 Address. . . . . . . . . . . :
Subnet Mask . . . . . . . . . . . :
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Enabled

To fix it, enter these from Command Prompt:

C:\Users\lyngtinh> netsh interface ipv4 show inter

result as:

Idx Met MTU State Name
--- ---------- ---------- ------------ ---------------------------
1 50 4294967295 connected Loopback Pseudo-Interface 1
11 10 1500 connected Local Area Connection

11: <=Keep it in mind

Next run this command:

C:\Users\lyngtinh>netsh interface ipv4 set interface 11 dadtransmits=0 store=persistent

Next, enter
Run > services.msc > disable DHCP Client service

Final, restart your server.

Good luck!

Tuesday, July 26, 2011

Fix unicode characters error for PHP 5.3.6 using FastCgi on Windows Server 2003

I have ever seen an error, the websites on my windows server 2003 can not show the unicode characters as normal in my language when I update PHP engine using ISAPI module to FastCgi for performance.

It was a bad day, when my customers called to me to complain about this. Because they can not read their website content as everyday, the characters are really crazy.

Yes, cause of this problems because I updated to PHP using FastCgi protocol. This protocol has some changes for mysql library.

To fix it,
- Open : Path_to_mysql/my.ini
- Find: default-character-set=.... and edit to: default-character-set=latin1
- Find: character-set-server=.... and edit to: character-set-server=latin1
- Start menu => Run => enter: services.msc => Find mysql service and restart it.

Okey, my websites came back as normal, work fine for me.


Cannot start mysql service on windows server 2003

Once you removed and reinstall Mysql on windows server 2003, you may facing to an error likes: "Can not start services".

To fix it, you have to remove all of the relating to mysql data at:
C:\Documents and Settings\All Users\Application Data\MySQL
C:\Program Files\MySQL (path to mysql implementation, this is an example of mine)
Okey, next step you may reinstall and restart mysql service as normal, it works for me.


Monday, July 25, 2011

The difference between CGI, ISAPI, and FastCGI


CGI is a protocol that allows information servers to interface with external applications. Because HTTP is stateless, any requests that are made over HTTP create a new instance of the external application in a new operating system process.

Within the new process, the stdin handle is remapped so that it receives request data from the client, the stdout handle is remapped so that it writes response data to the client, and the command line and operating system environment variables are set to provide other server and request information to the CGI process.

The disadvantage with CGI on IIS is the relatively expensive process creation on Windows operating systems. Every HTTP request creates a new process, performs the work inside the CGI application, and shuts down the process. On operating systems with light-weight process creation, performance is bound by the work that is completed inside the CGI application. On operating systems where process creation is expensive, such as Windows, performance of the CGI application is bound by spinning up the new process. This is the reason why CGI has performed well on a Unix-based platform, but has not been recommended for IIS.


Despite the disadvantage of CGI on Windows, IIS is capable of keeping up with, and often surpassing, the performance of other Web servers. The reason for this is Internet Server Application Programming Interface (ISAPI). Unlike CGI, ISAPI is completely internal to the Web server process. When a new request is made for an ISAPI application, a new process is not created. Instead, the Web server calls an entry point in a DLL that is loaded into the Web server process. If the ISAPI application is written with an understanding of how the operating system threading model works, the performance is extremely fast.

For many years, PHP has run on IIS through both ISAPI and CGI implementations. However, both implementations have disadvantages when running on IIS. As with all CGI applications, the CGI implementation of PHP has a disadvantage due to the performance characteristics of process creation on the Windows OS. The ISAPI implementation has a disadvantage due to threading issues.

When PHP runs as an ISAPI, it runs inside the Web server process in a highly multi-threaded environment. While the PHP implementation is thread-safe, many popular extensions to PHP are not thread-safe. If you use a non-thread-safe extension to PHP with ISAPI, the server can become unstable. Hence, many applications cannot run in the ISAPI PHP implementation, while other applications can run well in this environment.


FastCGI offers a solution that delivers both performance and stability. FastCGI allows the host CGI process to remain alive after one request finishes so that the process can be reused for another request. Since the process can be reused many times, the cost of process creation on the Windows OS is no longer an issue.

The technical difference between normal CGI and FastCGI is that FastCGI has a layer in the process that maps the FastCGI protocol into the stdin, stdout and other resources that CGI uses. Many third-party libraries can be linked into existing CGI source code with minor modifications to make them work with FastCGI.

FastCGI on IIS runs on top of ISAPI and can be broken down into the following parts: applications, the application manager, and the FastCGI protocol support code.

Because Web servers handle multiple, concurrent requests, a pool of processes must be available and ready to handle incoming requests. In the FastCGI handler, this pool of processes is called an application (to avoid confusion with IIS applications, this article uses the term "process pool"). There are a number of properties of a process pool that you can manage. For example, you can specify the number of processes in the pool, or the number of requests that a process is allowed to accept before it is shut down and recycled.

The FastCGI handler supports multiple process pools so that you can run more than one kind of FastCGI on a single server. For example, you can configure your server to support both PHP and Ruby on Rails. If you have multiple sites on your server and do not want requests for those sites to share the same processes, you can have the site processes run as different users. The part of the server that handles multiple process pools is called the application manager.

Setup PHP - Mysql - Phpmyadmin on Windows server 2003: using FastCgi

* FastCgi: (The difference between CGI, ISAPI, and FastCGI)
- I used ISAPI modules for the PHP implementation on my windows server 2003 therebefore, it's performance however I have ever seen some errors with this module on my php applications. Until, I moved to FastCgi. FastCGI offers a solution that delivers both performance and stability.
- On windows server 2003, fastcgi is not installed by default to IIS6 and 5.1, you will need to setup addition this protocol on your windows server.
- Download here:

* PHP:
- Download lastest PHP intaller on . I recommend to download for version 5.3.6 (.msi) or later (because this is fixed for sendmail use external SMTP, mean of you can send email work fine use other Smtp likes: , cause of openssl is enabled).
- Non thread safe & thread safe. PHP was released two version, and you can choose the version that depend your purposes. As you know, many popular extensions to PHP are not thread-safe, if the PHP implementation is thread-safe then the server can become unstable. Hence, many applications cannot run(ex: error of import database use phpmyadmin). Thus, I recommend to Non thread safe.
- In this post, I will use the PHP installer(.msi) for easy. No recommend for advanced users.

- Download Mysql msi installer for windows here:

- Download here:
- Classical UI: version to order
- New UI: 3.4 to later.

Step by step....
Step 1: Install FastCgi
Step 2: Install PHP use Msi installer with FastCgi option.
Step 3: Install Mysql and remember your root password
Step 4: Copy phpmyadmin to your webroot(ex: C:\inetpub\wwwroot). Modify file with your mysql root user/password.
Step 5: Restart IIS to apply the changes to IIS