Check CDN operation

Last update: April 04 2024

Check CDN operation

If there are errors or slow download speeds of content via CDN, check:

• balance. If there are insufficient funds in the balance, pay CDN;
• CDN-resource;
• content-download-speed from source and via CDN.

If the problem cannot be identified, collect data about the problem and submit a diagnostic request to technical support.

Check the CDN resource⁠

The check will show the correctness of the CNAME record and the availability of the file from the content source and CDN server.

1. Open the file on the content source using a link of the form site.com/images/image.png. If the file doesn't load, the problem is on the side of your site.
2. Open the file through the default domain using a link of the form *.selcdn.net/images/image.png. If the file does not load, check the CDN and Host header settings.
3. Open the file through your personal domain using a link of the form cdn.site.com/images/image.png. If the file does not load, check that the CNAME record is correct.

Check content download speed⁠

The first access to the content source takes longer to download the file than subsequent accesses (when the file is distributed from the cache). If a VPN or proxy is enabled, it may slow down the speed of content downloads.

1. Open the file on the content source and check the download speed, you can do this through the developer tools in your browser.
2. Open the file on domain that is used to distribute content via CDN.
3. Re-open the file on the domain with the CDN and check the download speed.
4. Compare the speed of downloading a file from the source and from the CDN cache. If the download speed through the CDN and from the source are the same, the CDN is working correctly. If the download speed via CDN is slower, leave diagnostic-request.

Leave a request for diagnostics⁠

To leave a CDN troubleshooting request, create a ticket.

1. Select the subject line Services.

2. Select CDN service.

3. Indicate the subject of the address.

4. Describe the problem, attach screenshots and specify:

   • CDN resource;
   • metrics from page https://iam.edgecenter.ru/info;
   • link to the file on the domain with the CDN (cdn.site.com/images/image.png);
   • speedtest results. The link to speedtest is on the https://iam.edgecenter.ru/info page under Server;
   • HAR file from the browser console (see Google documentation for details);
   • mass of requests with the problem and the location of users who have the problem.