Inbound authentication failed with error %1 for Receive connector %2. The authentication mechanism is %3. The source IP address of the client who tried to authenticate to Microsoft Exchange is [%4].

Details
Product: Exchange
Event ID: 1035
Source: MSExchangeTransport
Version: 8.0
Symbolic Name: SmtpReceiveAuthenticationFailed
Message: Inbound authentication failed with error %1 for Receive connector %2. The authentication mechanism is %3. The source IP address of the client who tried to authenticate to Microsoft Exchange is [%4].
   
Explanation

This Error event indicates that the inbound authentication from the specified source on the specified Receive connector has failed. The authentication error and the authentication mechanism are specified in the text of the error message.

The following authentication methods are available for inbound connectors on a Receive connector:

  • None

  • Transport Layer Security (TLS)

  • Mutual TLS authentication

  • Basic authentication

  • Basic authentication only after starting TLS

  • Exchange Server authentication

  • Integrated Windows authentication

  • Externally Secured

In the Exchange Management Console, you set the accepted authentication methods for inbound connections on the Authentication tab of the Receive connector properties page.

In the Exchange Management Shell, you set the accepted authentication methods for inbound connections by using the following parameters on the Set-ReceiveConnector cmdlet:

  • AuthMechanism

  • DomainSecureEnabled

  • RequireTLS

   
User Action

To resolve this error, verify that the Receive connector and the remote client are configured to use a common authentication method with the correct credentials and required certificates.

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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