The so-called "pan-domain name resolution" refers to using the wildcard * (asterisk) to make sub-domain names so that all sub-domain names point to the same IP address.
For example, your domain name is seoyj.cn:
Make a sub-domain name A record of *.seoyj.cn pointing to 222.222.222.222. Then after it takes effect, when the visitor enters "123.seoyj.cn" or "123.123.seoyj.cn", it can even be "!@#. Any characters like "$%$.6543.ww.a.seoyj.cn" can point to the IP address 222.222.222.222.
For some portals, in order to give users and visitors a good URL display, most of them used to enable the pan-parsing function, but now they have slowly canceled this function because search engines are really not good at it. When Nushi was doing SEO for a client recently, he enabled pan-analytics. In just one month, a word with a Baidu index of about 1,000 was posted on the Baidu homepage. Problems occurred in the next few days. Many friends said that under the homepage of the website Sorry, a very strange phenomenon occurred when I went to site: www.ganai.sx.cn on Baidu. There were two WWW URLs in the first place. At the beginning, I was scolding Baidu for being crazy. It was so unfair. Intelligent, I later found out that it was due to pan-analytics. When making a friendly link, a website with a relatively high weight added www again. As a result, a direct result was Baidu. The main domain name of this site is a site with two www.
There are two ways to deal with this situation:
1. Disable pan-parsing and use A record parsing. It will be normal in a few days.
2. Correct the connection error quickly and find a website with higher weight to connect to the correct URL.