Domain's IP address was changed (How to switch an IP address for a domain in Plesk).
Domain shows Web Server Default page, default Apache page, default website for IP or a blank page.
If the new IP and domain name are added to the local system's "hosts" file, correct content is displayed.
Domain resolves to the old IP address globally:
C:\> nslookup example.com 184.108.40.206
# host example.com 220.127.116.11
Using domain server:
example.com has address 203.0.113.2
Domain resolves to the old IP address globally due to the DNS caching.
Wait until the new values are propagated globally. It might take up to 48 hours.