Domain alias shows default Plesk page

Symptoms

• A domain web-server alias (not the CNAME alias) is shown as default Plesk page:

• Plesk DNS server is not authoritative for the web-server domain alias:

  # dig SOA alias.example.com | grep -A1 "AUTHORITY SECTION"
  ;; AUTHORITY SECTION:
  example.com 86400 IN NS somedns.local.

• IP address of web-server alias for domain differs from IP address for the main domain:

  # dig +short alias.example.com A
  203.0.113.3
  # dig +short example.com A
  203.0.113.2

Cause

Incorrect DNS configuration. IP address of web server alias for domain must match the IP address of the main domain.

Resolution

Access authoritative DNS server and change the A records for a domain alias so they will match the main domain's A records.