https protocol doesn't work for Power Panel.
Power Panel page doesn't include HTTP status code header, in result some browsers interpret it as text/plain and display HTML code to users instead of processing redirection directives.
This issue is recognized as PVA Agent bug with internal ID #PVA-33515.
The fix will be included in the future updates of PVA Agent.
To workaround the problem, run the following command on the node (once):
~# sed -i '1 iHTTP/1.0 200 OK\n' /var/opt/pva/pp/static/vz/http/400.html