Do not forget to change 127.0.0.1 with the IP of your server.
Also if you have a domain correctly pointed to your server's IP address it can be used like
https://www.onlinehowto.net:8443
Then if everything is fine you will see the Plesk login screen waiting for username and password as it is shown on the next picture above this paragraph.
Important: If you have more than three failed attempts, the login will be locked out for 30 minutes! In this case you can unlock it using one of these tutorials according to your operating system on the server:
Unlocking Plesk control panel under Linux
Unlock Plesk control panel under Windows
posted on 2010-Feb-08 | 10:04:20 PM
can u help me out that how to unlock control panel ip address.
Regards,
Sunil k Bhatt
posted on 2010-Feb-09 | 02:59:57 AM
posted on 2010-Feb-15 | 11:15:58 PM
posted on 2010-Feb-16 | 01:03:04 AM
UNLOCK PLESK WINDOWS
http://www.onlinehowto.net/Tutorials/Plesk-Control-Panel/How-to-unlock-Plesk-Control-Panel-login-on-a-Windows-server/423
UNLOCK PLESK LINUX
http://www.onlinehowto.net/Tutorials/Plesk-Control-Panel/How-to-unlock-Plesk-control-panel-on-Linux-server/421
Also you can use the Onlinehowto's search filed with string like 'unlock plesk' which will list related tutorials.