[Bug] server application unavailable

The error message is as follows:

Server application unavailable

 

The Web application you are attempting to access on this web server is currently unavailable. Please hit the "refresh" button in your web browser to retry your request.

 

Administrator Note: an error message detailing the cause of this specific request failure can be found in the system event log of the Web server. please review this log entry to discover what caused this error to occur.

 

At first I thought it was a permission issue, but after checking its permissions, I found that the permissions are correct ,??? So why is it wrong? Where is the problem? Coincidentally, the first time deploy encountered a problem with the application pool, I quickly checked the log and prompted that my application needs an "Application pool ". If you find the problem, you have to solve it .... Yes ~~ The solution is to set an "Application pool" for it "~!

 

The application pool is set in IIS. The simple procedure is: IIS --> Local Computer -->

Adding an application pool is probably like this! The next step is to assign the application pool we just created to our application, such:

 

 

In this case, the problem is solved ~!!!

 

For Windows 2000 systems, there seems to be no application pool settings (maybe I didn't find them, or why? If you know, please let me know, Thank you ). So what should we do if there are two deploy applications on the Windows 2000 server and the two applications are vs 2003 and VS 2005 respectively? Because I have a little understanding of the error principle, the root is like this:

This error is caused by the IIS6 application isolation mechanism. The default application isolation mechanism of IIS is called "Working Process Isolation Mode". In this mode, an application is divided into multiple groups, each of which is an "Application pool ", each application pool is isolated from each other. The benefits of isolation are security, stability, and so on. Each application pool in IIS is managed by a "worker process", that is, "w3wp.exe ". If you run multiple applications in the application pool, we can see multiple w3wp.exe. The created virtual directories are directed to the "ultultapppool" in iis6.

The cause of the above error is :.. NET Framework 2.0 program and. net framework1.1 (or 1.0) programs are put into the same application pool (ultapppool pool by default), that is, managed by the same worker process: w3wp.exe, however, a single working process cannot manage different programs (or different versions of programs) at the same time. If you first access. net Framework 1.1 page, the worker first loads and manages the assembly of Version 1.1. net Framework 2.0 web application page, the server application unavailable error is returned.

 

In this case, what should we do in Win 2000? You have to study it now ....