What is the name of the domain?
drop.mxlgsl.cn
What is the error number?
HTTP ERROR 403
What is the issue you’re encountering
dns 添加了解析后，通过解析去访问，无法访问
What feature, service or problem is this related to?
DNS not responding/updating
What are the steps to reproduce the issue?
A
mxlgsl.cn
121.xx.34.185
CNAME
drop
mxlgsl.cn
fritex
2
I received JS challenge at first visit:
Later I got error 521:
May I ask what troubleshooting steps have you tried already for 521 error? 
Does DNS record contain the correct origin host/server IP address?
Are Cloudflare IP addresses allowed to connect to your Website? No firewall running?
1 Like
system
Closed
3
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