How to deal with 503 service temporarily unavailable problem

503 is an HTTP status code, which is a return status of a server error. Due to temporary server maintenance or overload, the server is currently unable to process the request. This condition is temporary and will be restored after a period of time. So what should we do if we encounter 503 service temporarily unavailable?

If you are a website administrator

　1. First check whether you have turned off the application pool. Each website corresponds to an application pool (this is true for IIS servers). Of course, they may be the same application pool or they may be different. Check whether the application pool corresponding to the website where the 503 error occurs is open.

2. If the application pool is not closed, check whether the application pool queue is full when the request arrives. Each website has its maximum load. When the access request reaches this value, a 503 error will occur. The solution can be to increase the request queue. The default value is 1000.

3. There is another possibility that the application pool identity does not use the predefined account: Network Service, and the identity is configured by itself, but the configured This user does not belong to the IIS_WPG group. In this case, you can change the application pool path of the website to an application pool that belongs to the IIS_WPG group.

4. The CPU usage is too high, and the application pool has CPU monitoring enabled. If the CPU utilization exceeds a certain percentage, shut down the application pool. , and the server-side pages (.asp, .aspx) written by developers are not efficient in execution, which will cause the CPU to be occupied for a long time, eventually reaching the set percentage, causing the application pool to be closed. If you encounter this situation, you can restart the application pool.

If you are a visitor

1. First try to refresh and visit again. If the website If it is not closed, it is likely that the website is overloaded and this status may disappear immediately, so you may be able to access it after refreshing it a few times.

2. If refreshing does not solve the problem, you can try clearing the cache, restarting the browser, or directly changing to a browser with a different kernel. Some websites may not be compatible with certain browsers. (Some people on the Internet said that this can be solved, so I listed it here without commenting on its correctness)

　3. Contact the website management Member, if none of the above methods can solve the problem and you want to access the website again, you can contact the website administrator and ask him to solve the problem, because this situation may be caused by the website administrator being maintaining the website. At this time, you can only wait. Visited after maintenance.

4. Click here to enter the method or step

Notes

When increasing the request queue, you must pay attention to the load of your server to avoid increasing the load on the server and causing serious consequences.

When the application pool takes up a lot of CPU, you should pay attention to check whether the executable files (php, asp, etc.) in the website are not efficient in execution. This is the solution to this problem. fundamental method.

If the website administrator closes the application pool to facilitate maintenance, he can only wait for maintenance to open it.

Using alexa ranking, you can check the email address of the webmaster, so that you can contact the webmaster to inquire about the situation.

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