An authentication credential initialization error %1 occurred with Send connector %2. The authentication mechanism used was %3. The name of the server that we were trying to authenticate to was %4. This server was using the name %5. Try reentering the credential. If the problem persists, contact Microsoft Support Services.

Details
Product: Exchange
Event ID: 2016
Source: MSExchangeTransport
Version: 8.0
Symbolic Name: SmtpSendAuthenticationInitializationFailed
Message: An authentication credential initialization error %1 occurred with Send connector %2. The authentication mechanism used was %3. The name of the server that we were trying to authenticate to was %4. This server was using the name %5. Try reentering the credential. If the problem persists, contact Microsoft Support Services.
   
Explanation

This Error event indicates that the specified Send connector on the Hub Transport server or Edge Transport server experienced an authentication credential initialization failure with the specified remote server.

When a Send connector is configured to route outbound messages to a smart host, the following authentication methods are available:

  • None

  • Basic authentication

  • Basic authentication over Transport Layer Security (TLS)

  • Exchange Server authentication

  • Externally Secured

In the Exchange Management Console, you set the authentication methods for outbound connections to a smart host on the Configure Smart Host Authentication Settings tab after you click Change on the Network tab of the Send connector properties page.

In the Exchange Management Shell, you set the authentication methods for outbound connections to a smart host by using the SmartHostAuthMechanism parameter on the Set-SendConnector cmdlet.

   
User Action

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

  • Verify that the Send connector and the destination smart host are configured to use a common authentication method with the correct credentials and required certificates.

  • Reenter the username and password on the specified Send connector and at the remote server.

  • Make sure that the server that logged this event can connect to the specified remote server. For example, use the Ping or PathPing command-line tools to test basic connectivity. Use Ping to isolate network hardware problems and incompatible configurations. Use PathPing to detect packet loss over multiple-hop trips. For more information, see Microsoft Knowledge Base article 325487, How to troubleshoot network connectivity problems.

For more information, see the following topics:

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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