What to do if PHP cannot be accessed

PHP cannot be accessed?

Possible reasons why the PHP website cannot be accessed and solutions

1. 404 error occurs when accessing the website

A 404 error occurs when accessing the website, and the appearance of the HTTP 404 status code means The webpage pointed to by the link does not exist, that is, the URL of the original webpage is invalid. Possibility 1: The space structure file has been deleted. Contact the host customer service to initialize the space.

Possibility 2: The program is lost or deleted, redeploy the program.

2. 500 error when accessing

The 500 error is generally a problem with the website program file permissions. Possibility 1: The file permissions are incorrect and need to be modified manually. The full selection of the folder is 755. A single file is 644;

Possibility 2: It is caused by an error in the .htaccess file rules. Just rename the file or delete it.

3. A 403 error occurs during access.

403 error means access is denied. It is usually caused by space blocking IP. If an access to an IP is abnormal, the system will consider it an offensive IP. Therefore, it will be blocked. At this time, you can find "Block IP" in the control panel and delete the IP you are currently accessing the network from the blocked IP list.

4. Access will prompt DNS-related errors

DNS errors are domain name server problems. Before looking for a domain name provider, there are two solutions. Possibility 1: Resolution problem, the resolution does not take effect. Or the parsing method is wrong, you need to parse it correctly, and then wait for it to take effect; Possibility 2: The default DNS address is modified, usually the default one is used. Starting from July 18, 2016, domestically registered domain names require real-name authentication. If this happens, check whether the domain name has been authenticated by real-name authentication. Other possible reasons are that the domain name has expired without renewal and needs to be re-resolved after renewal.

5. Unable to access domestically, normal access abroad

Multiple devices and multiple regions in China are inaccessible. The possible reason why foreign countries can access is that the domain name is blocked. Solution: 1. Use Domestic server; 2. Bind a new domain name to the server and use a domestic forwarding server to jump the blocked domain name to the new domain name; [Recommended]. When using the second method, by setting up 301 and site-wide forwarding, the weight of the original domain name can be transferred to the new domain name. Or changing the domain name can also solve the problem.

6. A white screen appears when accessing the website

The white screen does not mean that the website cannot be accessed, it just does not display the content. It is usually caused by program configuration. All PHP open source may cause white screen. Screen phenomenon, because there are many possibilities involved.

7. Prompt database error

The bridge between the program and the database is the database configuration file. When this problem occurs, you must first check whether the database configuration is correct. The host address is set to localhost. Check the database account and user name. Whether the password is correct can be checked by logging in. If it is incorrect, it can be reset and reconfigured in the database management of the control panel. The possibility is relatively small, but it does not rule out that the database version is incorrect or there is a problem with the database. You can check it in the local environment.

8. When accessing, this IP is being shared among many domains...

means that the IP is being used by multiple domain names. Possibility 1: This is a shared IP that can only be bound to the top domain name. It cannot be accessed directly using IP. Possibility 2: Domain name resolution does not take effect. If the IP obtained by pinging the domain name is consistent with the space IP, it means it has taken effect. It may be caused by the browsing cache. Clear the browser cache before accessing.

9. The paused status is still displayed after renewal or upgrade.

The host expires or is shut down due to overcapacity. It is usually controlled by the system. When the space is renewed or upgraded, it will be automatically turned on, and a prompt will be displayed when accessing. The pause may be due to browser cache, which can be resolved by refreshing the browser multiple times or clearing all caches.

10. Too many redirects are displayed

Redirect problems are usually caused by modifying the hosts file. If the domain name resolution takes effect on the website, you can delete the local resolution and clear the browser cache. Access; if it is still possible because there is a dns cache in the router, restart the router.

11. The php version mentioned in the visit

The prompt information is different. For example, require php > 5.3.0, it means that the current version is lower than 5.3.0, and the host customer service is required to change to 5.3. or higher.

13. Errors caused by changing domain names

After changing the domain name of a website, some links may be inaccessible or the layout may be confusing. This is because the original domain name exists in the program or database, and it can be replaced after changing the domain name. solve.

14. "Internal Server Error The server...

encountered an internal server error or incorrect configuration and was unable to complete the access request. In order to protect users, the PHP virtual host server in the Linux environment The site is safe. The virtual host root directory is globally set to prohibit operations with permissions higher than 755. If the permissions of 777 are set in the program file, the permissions need to be reset.

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