many people ask why his server can't work normally,because he can't read this carefually!
After you have run the GIS Server Post Install
Now that you have run the GIS Server Post Install, you must do the following before you can start using the GIS server. You can always find this information in the topic "Getting started after install" in the ArcGIS Server Help.
1. Log out and log back into your operating system account or restart your machine. This will allow the permissions that you changed during the GIS Server Post Install to take effect.
2. Set up access to the GIS server. The ArcGIS Server security model uses the operating system's security model to determine who can connect to and administer the server. You will need to determine which users require administrative access to the server, and then use the operating system tools to add them to the ArcGIS Server Administrators group (agsadmin) on the server object manager (SOM) machine. At a minimum, you will need to add yourself to the agsadmin group
In the same way, you should identify which users will only need user-level access, and add them to the ArcGIS Server Users group (agsusers) on the SOM machine.
You do not need to add the SOM Account or the SOC Account to either of these groups.
3. Connect to your GIS server. To administer the server, you need to log in to Manager or create an administrative connection in ArcCatalog. You can then configure the server properties, add additional machines, and add services.
4. Add SOC machines to host services. During installation, you should have installed software on one or more machines to function as server object container (SOC) machines. The SOC machines host the services and are the work centers of your GIS server. The first time you connect to your GIS server, you'll need to link these SOC machines to the SOM.
5. Organize your GIS data and set the appropriate directory permissions. The services you run on your GIS server are created from the same resources that you work with in ArcGIS Desktop. These are resources such as ArcMap map documents. To publish them on your server, you must make these resources and any data that they reference accessible to the SOC machines and the SOC Account that you created during the GIS Server Post Install.
6. Add services to your GIS server. In order to make your GIS resources available to others, you need to publish them as services. As part of this process, you抣l specify which capabilities of the resource will be available to end users.
7. Create client applications or use ArcGIS Desktop to access your services. Once you add services to your GIS server, you can use them in Web or desktop applications. These can be Web mapping applications that you create with Manager, or they can be ArcGIS applications, such as Explorer, ArcMap, or ArcGlobe. Mobile devices can also make use of properly-configured services.