| Event Id | 2003 |
| Source | MSExchangeTransport |
| Description | Send connector %1 has failed to authenticate with %2. The response from the remote site is %3. |
| Event Information | According to Microsoft : Cause : This Warning event indicates that the specified Send connector has failed to authenticate with the specified remote server that is configured as a smart host. The response from the remote server is specified in the warning message text. When a Send connector is configured to route outbound messages to a smart host, the following authentication methods are available: 1.None 2.Basic authentication 3.Basic authentication over Transport Layer Security (TLS) 4.Exchange Server authentication 5.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. Resolution : To resolve this error, 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. |
| Reference Links | Event ID 2003 From Source MSExchangeTransport |
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