- How to allow access to Plesk:
from a hostname URL only (https://server.example.com:8443)?
from several URLs and block access to others?
How to block access to Plesk for a single domain URL only?
Currently, such functionality is not supported.
If you would like to see this feature in Plesk, please vote for it on Plesk UserVoice:
The top-ranked suggestions are likely to be included in the next Plesk releases.
Redirect all 8443 requests to a single URL
On Linux, configure a redirection so that all https://<domain_name>:8443 requests will be redirected to https://<hostname>:8443. To find out how, refer to this KB article.
Use Cloudflare to block access over 8443 for a domain
If domains are behind Cloudflare, it is possible to block all ports except 80 and 443 on the Cloudflare side. To learn more, visit this guide.