Article ID: 120059, created on Feb 11, 2014, last review on May 11, 2014

  • Applies to:
  • Plesk for Windows


I am unable to send emails. The following error appears:

Failed to write to socket: not connected

Also I cannot connect to the 25 port from localhost:

# telnet localhost 25
Connecting To localhost...Could not open connection to the host, on port 25: Connect failed


The issue caused by McAfee Anti-virus Standard Protection policy. It blocks outbound SMTP connection to the 25 port.


Please use McAfee Knowledge Base article to allow connections for your Mail Server in Anti-virus Standard Protection policy or disable this policy at all.

Search Words

smtp isuue

a914db3fdc7a53ddcfd1b2db8f5a1b9c 56797cefb1efc9130f7c48a7d1db0f0c 85a92ca67f2200d36506862eaa6ed6b8

Email subscription for changes to this article
Save as PDF