MSExchangeTransport 2015

  • Article

 

This article provides an explanation and possible resolutions for a specific Exchange event. If you don't find what you’re looking for here, try searching Exchange 2010 Help.

Details

Product Name

Exchange

Product Version

14.0

Event ID

2015

Event Source

MSExchangeTransport

Category

SmtpSend

Symbolic Name

SmtpSendTLSRequiredFailed

Message Text

Send connector %1 couldn't connect to remote domain %2. The send connector requires Transport Layer Security (TLS) authentication, but is unable to establish TLS with the receiving server for the remote domain. Check this connector's authentication setting and the EHLO response from the remote server %3.

Explanation

This Error event indicates the specified Send connector must use Transport Layer Security (TLS) for all messages that are sent to the remote server. However, the remote server is not configured to accept TLS.

A Send connector requires TLS for all sent messages when the RequireTLS parameter on the Set-SendConnector cmdlet in the Exchange Management Shell is set to the value $true. The default value is $false.

If the remote server is configured to accept TLS, the remote server displays 250-STARTTLS in the response to the EHLO command. If the remote server does not display 250-STARTTLS in the response to the EHLO command, the remote server is not configured to accept TLS.

User Action

To resolve this error, do one or more of the following:

  • Configure the remote server to accept TLS. If the remote server is a Microsoft Exchange Server 2010 or Exchange Server 2007 Hub Transport server or Edge Transport server, the AuthMechanism parameter of the relevant Receive connector must contain the value TLS.

    You can verify that the remote server accepts TLS by using Telnet on port 25 to connect to the remote server and observing 250-STARTTLS in the response to the EHLO command.

  • Configure the specified Send connector not to require TLS by setting the RequireTLS parameter on the Set-SendConnector cmdlet in the Exchange Management Shell to the value $false. The default value is $false.

For more information, see the following topics:

For More Information

If you are not already doing so, consider running the Exchange tools, which have been created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues and improve mail flow. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.