Website shows Plesk default page in a Plesk server behind NAT

Symptoms

• Website hosted in Plesk shows Plesk default page or Apache default page when accessing it via web browser.
• Plesk server is behind NAT, configured with internal IP addresses.
• There isn't public IP assigned to the private IP in Tools & Settings > IP Addresses

• Domain example.com resolves to a public IP address:

  # dig +short example.com
  203.0.113.2

• In Linux, running tcpdump utility in Plesk server shows that domain's traffic goes to internal IP 192.0.2.2 with the following command:

  Note: IP 203.0.113.5 represents the public IP address where the website is requested from.

  # tcpdump -n "dst port 80 and src host 203.0.113.5"
  ...
  05:22:50.870868 IP 203.0.113.5.57486 > 192.0.2.2.http: Flags [F.], seq 1635309888, ack 2130394795, win 16425, length 0
  ...

• In Windows, Plesk may not be accessible:

  CONFIG_TEXT: This site can't be reached

Cause

Incorrect IP address mapping is configured in Plesk.

Resolution

1. Log into Plesk

2. Map external IP address 203.0.113.2 as Public IP address in Tools & Settings > IP Addresses > 192.0.2.2 > OK:

   

3. Go to Domains > example.com > Hosting & DNS > Hosting and ensure that the domain's IP address shows the domain's public IP address.
4. If the issue persists and the changes are not reflecting on the website, contact a network administrator to ensure that NAT translation for the domain is properly configured in the external firewall.