When two Exchange Server computers are connected with an X.400 Connector, mail may queue up in both X.400 queues and not flow in either direction. If the message transfer agent (MTA) becomes backed up while it is trying to deliver messages, and the transport connection is lost, the following error messages may appear in the Windows NT Event Viewer Application log:
Event ID: 4282
Source: MSExchangeMTA
Category: X.400 Service
Description: An interoperability error occurred. Interface protocol 131 was violated. Error code=8453 [POP4 MAIN BASE 1 18] (14)
Event ID: 4283
Source: MSExchangeMTA
Category: X.400 Service
Description: Unable to recognize an internal message identifier. Internal connection handle (LP1) 1-3-14 Error code=8464 [POP4 POP4 UP 5 228] (14)
Event ID: 4284
Category: X.400 Service
Source: MSExchangeMTA
Description: An error has occurred during connection/disconnection. Error code=8511 [POP4 POP4 DOWN 4 179] (14)
Event ID: 4287
Category: X.400 Service
Source: MSExchangeMTA
Description: An internal MTA occurred. Contact Microsoft Product Support Services. Error code=8650 [POP4 POP4 DOWN4 18] (14)
Event ID: 1209
Category: X.400 Service
Source: MSExchangeMTA
Description: Unable to recognize an internal message identifier (LPI) from entity x.500 name. The incorrect LPI is %1 - % 2 - %3. Control block index %4.
Event ID: 1198
Category: X.400 Service
Source: MSExchangeMTA
Description: An error occurred while processing an association to entity.
Presentation error: state check failure. Current state 0, service type 20, service flavor 2 Control block index 3. The association will be terminated and restarted if necessary. [PLATFORM KERNEL 27 108] (14)