If your Hong Kong cloud server is inaccessible, this may be caused by a variety of reasons. Here are some possible causes and solutions:

　　Network failure:

　　First, please make sure that your cloud server is online and the network connection is normal. You can use command line tools such as ping or traceroute to test connectivity between the server and other websites. If the server cannot ping external websites or has problems with traceroute, there may be a problem with the server's network configuration.

　　Solution: Check the server's network configuration to ensure that the network settings are correct. You can also contact your cloud service provider to ask if there are any network issues.

　　Firewall settings:

　　Firewall configuration may prevent the server from accessing external websites. Check the firewall rules on the server to make sure outbound traffic is not blocked.

　　Solution: Check the firewall rules on the server and make sure the necessary outbound traffic is allowed.

　　DNS problem:

　　DNS (Domain Name System) issues may cause the domain name to fail to resolve to the correct IP address.

　　Solution: Try using another domain name or directly using the IP address to access the website to determine if it is a DNS problem. If it's a DNS issue, you can change the DNS server settings or try a different DNS server.

　　Cloud service provider issues:

　　Occasionally, a cloud service provider may experience network or hardware issues that render the server inaccessible.

　　Solution: Check the cloud service provider's service status page to see if there are known issues or fault reports. If there is a problem, usually they can provide a solution or an estimate of how long it will take to fix it.

　　Security group settings:

　　Some cloud service providers use security groups to manage network access to servers. Incorrectly configured security groups may prevent access to external websites.

　　Solution: Check the server's security group settings to ensure that necessary outbound traffic is allowed.

　　Domain name expiration:

　　If the website you are visiting uses a domain name and the domain name has expired or has not been renewed, you will not be able to access the website.

　　Solution: Contact the website administrator or domain name registrar to learn about the domain name status and renew it.

　　IP is blocked:

　　If the server's IP address is blacklisted or blocked in some way, you will not be able to access certain websites.

　　Solution: Check if there are any blocks or restrictions associated with your IP address. If so, contact the relevant service provider to resolve the issue.

　　If you still cannot solve the problem, it is recommended to contact your cloud server provider's technical support team, they will be able to provide professional help and guidance. The final solution may depend on the specific situation and server configuration.