WebService problem: the remote name cocould not be resolved

When I got up early this morning, I found my website pass was paralyzed and could not be displayed. I immediately went to the server to call the pass. The error message is as follows:
The remote name cocould not be resolved: 'xx. com'

Description:An unhandled exception occurred during the execution of the current Web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception details:System. net. webexception: the remote name cocould not be resolved: 'xx. com'

It seems that the server cannot be parsed, so the asmx of the WebService can be directly connected, and the page cannot be displayed directly. what's more strange is that only this server can be connected. as a result, I began to suspect that it was a DNS problem. I pinged the Domain Name of the pass Service on the faulty server and found that the ping failed. Then I pinged a domain name at will, just like Ping failed.
The problem seems to be DNS. I called the IDC and asked what happened. He told me that DNS in the XX region was suspended today and asked me to change the DNS... I was too busy for a long time, so I changed my DNS and tested it. No problem.
If you have friends with the same problem, you can refer to the solution.