Looks like you are getting this issue because of same hostname of your server, server treats your URL for Plesk login page. Let’s see how to resolve this issue:
- Login to Plesk.
- Click on “Tools & Settings” option in left side of your plesk panel.
- Now select “Server Settings” option.
- You will get the option “Full hostname” under “System Settings” section.
- Now enter full hostname and your hostname should be Fully Qualified Domain name(FQDN) and also its IP address resolves to server’s IP address.