Login to panel using standard SSL port with additional IP address only used for Panel login.
Plesk default configuration needs to use TCP 8443. This port is blocked by many corporate firewalls and generally looks tacky that the user needs to specify this in a URL.
There are numerous posts on how to achieve this using a dedicated IP address for the Plesk Panel, while all other functions including mail, web, dns use the real Plesk IP address.
Parallels should allow this configuration and support it where a secondary IP address can be assigned to Plesk Panel instead of using the non standard SSL port of 8443.
Douggie
shared this idea
A panel cannot physically work on standard port since it resides on different web server and the standard port is already taken by a standard web server.
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jd
commented
This isn't really true, it would be possible to bind the apache webserver directly to the ip address instaed of 0.0.0.0, so it would be possible to bind plesk to another IP address with the same port.
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Douggie
commented
Instead of the default https://panel.zone.com:8443 we should be able to use a different hostname and TCP443 ie
https://webpanel.zone.com
(Thought would make it a bit clearer!)