Service Unavailable cause analysis

Source: Internet
Author: User

There are several possibilities:

1. If the "Service Unavailable" prompt appears, refresh the page and access it.

This is because your website exceeds the iis limit.
As the operating system of 2003 prompts that IIS is too large, it does not mean that the system prompts "too many connections", but prompts "Service Unavailable ", this is because the website exceeds the system resource limit, mainly because the program occupies too many resources.
For example, for online forums of 100 people, leiao Forum accounts for more than 10 times the resources occupied by PW forums. In addition, some endless loop programs, or the program that is not optimized will occupy too much system resources, and the system resources are obviously limited. However, in the Windows operating system, each website runs in an independent process and does not affect each other.
If a website program occupies too many resources or has too many errors, the system log will prompt: "The application pool 'xxx' is automatically disabled, the reason is that a series of errors occur in the process that provides services for this application pool, or the prompt is: The application pool 'xxx' exceeds its job restriction settings. When you access this website, the message "Service Unavailable" is displayed. Generally, the system returns to normal in about 30 seconds, and can be accessed after several refreshes.

In addition, if your website currently has too many visitors and exceeds the system's iis connection limit, a message indicating Service Unavailable will also appear (if there are too many connections on the win2k host, a prompt will be displayed: too many connections, please try again later. The win2003 host just prompts: Service Unavailable)

2. There is no restriction on IIS connection, or Service Unavailable
More common in websites using ACCESS databases
If you are using windows 2003 IIS 6, this problem may occur on a normal system. Suddenly, a website cannot be opened.
Prompt: Service Unavailable, but this website does not limit the number of IIS connections. Then it immediately affected other websites. In a short time, all other websites were changed to Service Unavailable.
Why?
After analysis, we can see that it is still the old problem of MS. The ACCESS engine is ready. Use the server doctor's file to repair the fault. When you view the repair result, you will find that some files cause a "catastrophic fault" of the ACCESS Engine and an "instance where the object is not referenced" error. After the file is repaired by the doctor, the system will recover to normal.

3. When you browse a Windows SharePoint Services Web site, the message "Service Unavailable" is displayed.

1. Microsoft Internet Information Service (IIS) 6.0 does not correctly configure the application pool for the virtual server, this problem may occur.
Solution
To solve this problem, follow these steps: 1. Verify that the application pool is configured for the virtual server. The default application pool is MSSharePointPortalAppPool.
Follow these steps to determine the application pool that the virtual server is using.
A. Click Start, point to administrative tools, and click Internet Information Service (IIS) manager ".
B. Expand "ServerName", expand "Web site", right-click the virtual server, and then click "properties ".
C. Click the "home directory" tab. The application pool configured for the virtual server is listed in the application pool box.
D. Click OK ".

2.
Verify that the password used by the application pool account is correct. IIS does not automatically poll the password changes in the Active Directory Service. If the application pool account is a domain account whose password has expired, after you specify a new password for the account, you may receive the error message described in the "symptoms" section.

3.
Verify that the application pool account is a member of the IIS_WPG group and STS_WPG group on the server.

4.
Restart IIS to recycle the application pool

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