An error message 520 is displayed when accessing a new domain name

Website, Application, Performance DNS & Network
1

What is the name of the domain?

file.onew.pp.ua

What is the error number?

520

What is the error message?

Web server is returning an unknown error

What is the issue you’re encountering

An error message 520 is displayed when accessing a new domain name

What steps have you taken to resolve the issue?

I turned off Xiaohuangyun and paused the parsing from Cloudflare, which can be accessed through the specified port. And my other domain names can also access the server normally, such as file.onedabuliu.cn, so now only these two new domain names cannot be accessed

What feature, service or problem is this related to?

Secondary DNS

What are the steps to reproduce the issue?

I applied for two new domain names, which are onew.pp.ua and onedabuliu.pp.ua, but I get an error message 520 when I visit, the following is a screenshot of my DNS and origin rules, as well as a screenshot of the error

2

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Snipaste_2025-03-19_10-29-211910×946 90.9 KB

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Snipaste_2025-03-19_10-30-221910×946 95.7 KB

4

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Snipaste_2025-03-19_10-30-461920×1050 116 KB

5

What do you mean “specified port?” Normally, it’s Port 80 for HTTP and 443 for HTTPS. Do you have to add a port number to reach your site without Cloudflare?

6

Yes, I mean that you need to add a port number to be able to access my website without cloudflare (my website only has public IPv6)

7

This is my HARharhar

8

Now I’m having the same problem with my domain to my friend’s Cloudflare account, so I think it’s my domain

9

IPv6 addresses use the same ports as IPv4 addresses. Which port does your site use?

10

The port of my website is 12345.Just like the port in my screenshot above

11

I’m just not seeing that anywhere. But you can route requests for your site to a specific port by using an Origin Rule:

12

Of course, my current domain name is accessed through origin rules (file.onew.pp.ua), but I don’t know why it shows a 520 error (Web server is returning an unknown error). This is strange because my other domain is also accessed through origin rules (file.onedabuliu.cn), and this domain can access the website without errors.

13

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