Server Application Unavailable

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 application event log of the web server. please review this log entry to discover what caused this error to occur.

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The cause is:

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.

 

.. Net Framework 2.0 program and. net Framework1.1 (or 1.0) programs are put into the same application pool by default into the DefaultAppPool pool), that is, managed by the same worker process: w3wp.exe, 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. otherwise, if you access the 2.0 web application before w3wp.exe in the development application pool is started, the application assembly has been loaded.. net Framework 1.1 Web assembly). When you access the Web application page of 1.0 or, "the server application is unavailable"

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Solution:

1) First, go to cmd and switch the directory to % SystemRoot % \ Microsoft. Net \ framework \ % SystemRoot %.

(C: \ Windows)
2) run the "net stop w3svc" command to stop the w3svc service;
3) run the following command to switch to the lower-level Directory: cd v2.0.5 *;
4) execute “aspnet_regiis.exe-ua to uninstall. Net installation;
5) reinstall. Net to IIS and then restart aspnet_regiis.exe-I"
6) Restart w3svc and enter: net start w3svc.

 

This article from the "Wolf soul" blog, please be sure to keep this source http://itwolf.blog.51cto.com/3286625/1227196