# ESB Reason Codes

The following table describes the ESB reason codes for Substation ES.

Code | Description
--- | ---
`44190` | FAIL_BES_TIMEOUT
The back-end interface timed out on a request to send a message to the ESB. The back-end system waits up to 180 seconds for the transport to deliver the message to the ESB and confirm it with the BES. When this period expires the message is sent to the DMQ with a 44190 status.
`44100` | FAIL_CV_GENERAL
A general data transformation conversion error has occurred.
`44101` | FAIL_NO_DEFINITION
The Trigger definition selection was not found for the outbound data message. User Response: Verify if the search key is valid or the intended trigger service name has been correctly specified. The data is written to a DMQ.
`44150` | FAIL_NO_DELIVERY
A BES-triggered message cannot be delivered because of no connection to the applicable messaging interface defined in the definition. The data is written to a DMQ.

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