Event ID - 9323

Event Id9323
SourceMSExchangeMTA
DescriptionAn interface error has occurred. An MtaUnBindBack over RPC has failed. Locality Table (LTAB) index: 73, NT/MTA error code: 1783. [BASE IL MAIN BASE 5 519] (14)
Event InformationAccording to Microsoft:
Cause:

The Dynamic RAS Connector may fail to transfer mail after you upgrade to Microsoft Windows NT Server version 4.0 Service Pack 4.the remote server recieves this event.
WORKAROUND:
There are two workarounds:
• On all servers that are initiating the connection:
1. Start the Exchange Server Administrator program.
2. In the left pane, click the Connections object, and in the right pane, double click the Dynamic Ras Connector to be modified.
3. Click the RAS Override tab, and specify an account other than Service in the Connect As portion.
The alternate account specified must have Service Account Admin permissions on the remote Exchange Server computer.
• Copy in Rassapi.dll from a Windows NT Service Pack 3 installation to the Winnt\System32 directory.
Reference LinksDRAS Failing after You Upgrade to Windows NT 4.0 Service Pack 4

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