Java project domain name access fails but IP access is normal

1. The domain name access fails but the IP access is normal

Possible reasons for this type of situation are as follows:

• DNS resolution problem: domain name access failure may be due to DNS resolution problems, resulting in the domain name cannot be resolved into the correct IP address. You can check whether the DNS resolution is normal by using the nslookup or dig command.

• Domain name resolution error: In some cases, domain name resolution error may cause domain name access failure. For example, if the domain name is resolved to the wrong IP address, or the domain name is not configured with CNAME or A records correctly, domain name access will fail.

• Firewall or router setup issues: A firewall or router may be blocking domain access, or routing domain access traffic to the wrong destination. You can check your firewall or router settings to make sure domain name access is properly allowed and routed.

• Web server configuration issues: The web server may not be properly configured for domain name access, or the virtual host may not be configured correctly. You can check your web server's configuration files to make sure the domain name is configured correctly.

• Domain name resolution cache problem: If you have accessed the domain name before, there may be a domain name resolution cache problem, resulting in failure to access the domain name. You can try clearing your DNS cache or browser cache and accessing the domain name again.

2. Domain name access is available again after restarting the project

Possible reasons are:

• After restarting the project, the web server configuration problem was solved: If the domain name access failed because the web server did not configure the domain name access correctly, then the web server configuration file may be reloaded after restarting the project, which solved the configuration problem and made the domain name available again. visited.

• After restarting the project, the domain name resolution cache is cleared: If the domain name resolution cache problem occurred when accessing the domain name before, resulting in failure to access the domain name, then the DNS cache or browser cache may be cleared after restarting the project, so that the domain name can be accessed again.

• After restarting the project, other problems were solved: If the domain name access failure was caused by other problems, such as DNS resolution problems, firewall or router setting problems, etc., restarting the project may solve these problems and make the domain name accessible again.