I proxy 443 through dns, the source server port is also 443, why can’t I access it. Changed to 8443, the source server is also 8443 and can be accessed. what is the problem
May I ask which error do you get in your Web browser, if so? 
Could you share a screenshot of it?
Regarding 443/8443, may I ask if you have got a valid SSL certificate installed at your origin host/server?
Before moving to Cloudflare, was your Website working over HTTPS connection?
May I ask what SSL option have you got selected under the SSL/TLS tab at Cloudflare dashboard for your domain ( Flexible, Full, Full Strict … )?
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May I ask which error do you get in your Web browser, if so?
answer：when I use 443， Connection timed out Error code 522，but 8443 is working ， origin server is ALIYUN ServerLoadBalance ， listen ports 443 and 8443 at the same time. the configuration is the same. only the listening ports are different
Regarding 443/8443, may I ask if you have got a valid SSL certificate installed at your origin host/server?
answer：yes， Normal when accessing without dns proxy
Before moving to Cloudflare, was your Website working over HTTPS connection?
answer：yes
May I ask what SSL option have you got selected under the SSL/TLS tab at Cloudflare dashboard for your domain ( Flexible, Full, Full Strict … )?
answer：Flexible
The network map
Flexible always makes an unencrypted connection to port 80. It is an insecure setting that should not be used.
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Thank a lot, when I set Full Strict , the 443 is working!
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