After migrating my DNS from tencent dnspod to CF, all websites cannot be opened

Website, Application, Performance DNS & Network
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After migrating my DNS from tencent dnspod to dnspod, all websites cannot be opened. The access error is ERR_CONNECTION_CLOSED. My cloudflare prompts me that there is no certificate covering this host name, but all my website domain names have free certificates from Let’s Encrypt or ZeroSSL. Please tell me. Can you help me find out what the problem is?

Some of my domain name records are resolved normally and can be Tcping, but the website cannot be accessed. My website is deployed on port 38906. I tried Tcping port 38906, but it is also unreachable. What is the problem? I tried Tcping my ssh port 16666, and my ufw firewall has allowed port 38906 in both directions, so it doesn’t seem to be a firewall issue.

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If the hostname is 1panel.sz.cx330.top, then Universal SSL won’t provide a certificate for that.

https://developers.cloudflare.com/ssl/troubleshooting/version-cipher-mismatch/#multi-level-subdomains

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But I applied for the certificate as 1panel.sz.cx330.top, which worked fine when I used Tencent dnspod before.

If it is a problem with multi-level sub-domain names, then the domain name pan.cx330.top:12778 also uses a lets encrypt certificate, so why can’t it be accessed?

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Hi @gdzyszljn, your topic has a solution here.

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