Transport failed to connect to the server

This topic describes how to troubleshoot an issue related to SMTP protocol.

Symptoms

Note: This topic applies to only on-premises environments.

When you attempt to send an email with the SMTP protocol, or if you receive a similar error when testing the SMTP protocol using Telnet, TaskMan returns this error: 

The transport failed to connect to the server.

Possible solutions

The firewall or antivirus software on the mail server might be blocking the email.

Related topics
  • Setting up the application server to send and receive emails