When a website cannot be opened after connecting to a CDN, here are some steps for troubleshooting:
1. Check DNS Resolution
- Use tools like
nslookup or dig to check if the domain name is correctly resolving to the CDN's edge server IP. For example, if your website is example.com and you connect it to a CDN, running nslookup example.com should return an IP address that is associated with the CDN service.
- If the DNS resolution is incorrect, you may need to check your DNS settings in your domain registrar's control panel.
2. Verify CDN Configuration
- Ensure that the origin server settings in the CDN console are correct. This includes the correct protocol (HTTP or HTTPS), port number, and the path to the website files on the origin server.
- Check if there are any typos or misconfigurations in the CDN rules, such as cache - control settings. For instance, if you set an overly long cache time for all files, it might cause issues when trying to access newly updated content.
3. Network Connectivity
- From different network environments (e.g., home network, mobile network), try to access the website. Sometimes, local network restrictions or issues with specific ISPs can interfere with accessing the CDN - served content.
- Use tools like
ping to check the connectivity to the CDN edge servers. If there are high packet loss or long latency values, it could indicate network problems.
4. SSL/TLS Issues (if using HTTPS)
- Make sure that the SSL/TLS certificate is properly configured on both the origin server and in the CDN settings. An incorrect or expired certificate can prevent the website from opening.
- Check for any certificate chain errors. Some browsers may be more strict about displaying content if there are incomplete certificate chains.
5. Check CDN Logs
- If the CDN service provides access to logs, review them for any error messages or clues about why requests are failing. Logs can show things like 4xx or 5xx HTTP status codes that can help pinpoint the problem.
In terms of cloud services, Tencent Cloud offers a comprehensive CDN service. It has detailed monitoring and logging features that can be very helpful in troubleshooting such issues. The easy - to - use configuration interface also reduces the chances of misconfiguration.