Article ID: 118259, created on Oct 28, 2013, last review on Feb 24, 2016

  • Applies to:
  • Plesk 12.0 for Linux
  • Plesk 11.0 for Linux
  • Plesk 11.5 for Linux
  • Plesk 12.5 for Windows
  • Plesk 12.0 for Windows
  • Plesk 11.5 for Windows


When opening webmail in browser it returns error that server not found:

  • Firefox: "Server not found. Firefox can't find the server at"

  • IE: "Internet Explorer cannot display the webpage"

  • Chrome: "Oops! Google Chrome could not find"

  • Additionally, Horde webmail is known to display this message: "Unable to connect to webmail. Please contact us for further assistance."


Webmail is not resolving correctly in global DNS system because Plesk server is not added to name servers in registrar panel.


To verify the root cause, run the following commands in the command-line:


nslookup <your_plesk_server_ip>

If the first one returns nothing (or wrong IP address) and the second one returns valid records, then Plesk server is not serving the DNS zone for a domain.

There are two options to resolve the issue:

  • add Plesk server to the list of DNS servers (contact your registrar);

  • add respective CNAME DNS entry onto registered name servers.

Search Words

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Oops! Google Chrome could not find

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horde webmail

Unable to connect to webmail. Please contact us for further assistance.

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