If after you begin using Alibaba Cloud CDN, your users reported slow website access, errors, or files update failures, etc.,
you could ask your users to perform nslookup on the CDN domain to retrieve the IP address it points to, then ping its IP address to check the latency.
Go to User Diagnostic Tools to check if ldns and local IP address are normal.
If step 1 appears normal, then perform nslookup on the CDN domain and see if the node is in close proximity to you.
If the above procedure does not clarify the problem, move on to the next step to see if there are any problems with the origin site.
Next, bind the user node to your local hosts. Example: edit
c:\Windows\System32\drivers\etc\hosts with IP first and domain name next:
Save it and ping the domain name in the command prompt. You will see that the resolved IP is as same as that of the hosts, to which your direct users have access.
Now you can clear your cache, refresh the page, and see if access is normal. This way, you can determine whether the problems lie with the Alibaba Cloud CDN node or in your users’ network.
(Note: When testing, you need to have the same operator as that of the CDN node accessed by your direct users)