How to fix the website that cannot be opened? Super detailed troubleshooting and handling guide

in the daily Internet or website operation process, the website can not be opened is a very easy problem to encounter, small personal blog can not be accessed, large to the company's official website service interruption, will bring different degrees of impact. Many people encounter such problems are often at a loss, do not know where to start troubleshooting. This article will start from the local to the server, from hardware to software full link, for you to disassemble the website can not be opened in detail troubleshooting and repair steps, covering a variety of common scenarios of solutions to help you solve problems efficiently and avoid unnecessary losses.

, the local network failure caused the website can not be opened?

many times the website cannot be opened is not the problem of the website itself, but the local network environment is abnormal, which is the most basic and easiest to check the link.

1 Check local network connectivity

first try to access other well-known websites, such as Baidu, Tencent, etc. If these websites cannot be opened, the probability is a local network failure. You can restart the router or light cat, wait for the device to re-dial the connection before trying to access; if you are using a mobile data network, you can switch the airplane mode and reopen it, or replace other network environment tests.

2, check the local DNS configuration

DNS is responsible for changing the domain name resolution to the server Internet Protocol Address. If the DNS configuration is wrong or the cache is abnormal, the website will not be able to open. You can try to empty the local DNS cache. The Windows system can enter ipconfig /flushdns through the command prompt, and the Mac system can enter sudo dscacheutil -flushcache at the end point. You can also manually replace the public DNS, such as Alibaba Cloud DNS223.5.5.5 or Google DNS8.8.8.8, and then test whether the website can be accessed normally.

Second, the server abnormal trigger website can not be opened?

if there is no abnormality in the local network, the problem may be on the server where the website is located, the server is the core carrier of the website operation, any abnormality will directly lead to the website can not be opened.

1, check the server running status

through the server provider's background management panel, check whether the server is in normal operation, whether there is a shutdown, restart or resource exhaustion prompt. If the server shows offline, you can try to log in remotely to restart the server, if you can't log in remotely, contact the service provider to assist in processing; if the server is online but the CPU and memory occupancy are too high, you can log in to the server to close unnecessary processes, release system resources and then test website access.

2, check the server firewall settings

server firewall are not set properly, it will intercept normal website access requests, resulting in the website not being opened. You can log in to the server management panel to check whether the firewall has opened the corresponding ports of the website, such as port 80 of the HTTP service and port 443 of the HTTPS service, to ensure that these ports are open; you can also temporarily close the firewall and test whether the website can be accessed. If you can access it, you need to adjust the firewall rules to allow external requests from the relevant ports of the website.

Third, the wrong domain name configuration to the website can not be opened?

domain name is the access entrance of the website, there is a problem with the domain name configuration, and users naturally cannot access the website through the domain name, which is also one of the common reasons why the website cannot be opened.

1, check the domain name resolution status

check whether the A record or CNAME record of the domain name points to the correct server Internet Protocol Address through the domain name resolution query tool, such as the DNS query function of the webmaster tool. If the resolution record is wrong or not effective, you need to log in to the domain name management background to modify the resolution configuration to ensure that the record value is consistent with the server IP. After modification, it usually takes 10-30 minutes for the global effective time. Wait for the effective time before testing the website access.

2, check the domain name valid period and record status

if the domain name has expired, it will be suspended by the domain name service provider, which directly leads to the website not being opened. You can log in to the domain name management background to view the expiration time of the domain name, and complete the renewal and recovery of the resolution in time; in addition, the website built by the domestic server must complete the ICP filing. If the filing expires or is cancelled, the website will also be forcibly shut down, and you need to log in to the filing system to complete the filing update or re-record.

4, the website program failure caused the website can not be opened?

if there is no abnormality in the server and domain name, the problem may lie in the program code or file configuration of the website itself, which is the most prone to failure within the website.

1, check the website program code error

website program code syntax errors, logical errors, such as PHP code error, database connection configuration error, etc., will cause the website to fail to open. You can check the specific error message through the server's website log function, such as Nginx or Apache error log, according to the log prompt to locate the code problem and fix; if it is a website built with a CMS system, such as WordPress, you can also try to disable the recently installed plugin or switch the default theme to troubleshoot whether it is a plugin or theme conflict.

2, check the website file permission configuration

the permissions of website files or directories are not properly configured, it will also cause the server to fail to read program files normally, causing the website to fail to open. For example, Linux server, the permissions of website files are usually set to 644, and the permissions of directories are set to 755. If the permissions are too high or too low, it will affect the normal access of the server. You can adjust the permissions of website files and directories through the server's file management tool or end point command to ensure that the server has the permissions to read and execute.

To sum up, the troubleshooting and repair of the website cannot be opened needs to follow the logical sequence from local to server, from external to internal, first troubleshoot the local network and DNS configuration, then check the server running status and firewall settings, then verify the domain name resolution and filing status, and finally troubleshoot the website program and file permissions. According to this process, you can quickly locate the root cause of the problem and complete the repair, minimizing the negative impact of the website cannot be opened.