alternative access
To access the Plesk default configuration of port 8443 must be used yes . This port is for example of many commercial firewalls IWSS blocked - usually it is not possible einzuloggen- located in Plesk as it looks from the panel access via an alternative address , for example : to enable https://www.meineadresse.de/zugang/ . rather than via the port 8443
1
vote
You can find this information http://kb.odin.com/en/138 for this purpose. Let us know if it doesn’t help.