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This section describes error codes and their meanings.
Transport error codes
| Error Code | Detail |
| 101000 | Receiver input/output error sending |
| 101001 | Receiver input/output error receiving |
| 101500 | Sender input/output error sending |
| 101501 | Sender input/output error receiving |
| 101503 | Connection failed |
| 101504 | Connection timed out |
| 101505 | Connection closed |
| 101506 | NHTTP protocol violation |
| 101507 | Connection canceled |
| 101508 | Connection timed out |
| 101509 | Send abort |
| 101510 | Response processing failed |
If the HTTP PassThrough transport is used, and a connection level error occurs, the error code is calculated using the following equation:
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Following are the possible protocol states and the description for each:
| Protocol State | Description |
|---|---|
| REQUEST_READY (0) | Connection is at the initial stage ready to send a request |
| REQUEST_HEAD(1) | Sending the request headers through the connection |
| REQUEST_BODY(2) | Sending the request body |
| REQUEST_DONE(3) | Request is completely sent |
| RESPONSE_HEAD(4) | The connection is reading the response headers |
| RESPONSE_BODY(5) | The connection is reading the response body |
| RESPONSE_DONE(6) | The response is completed |
| CLOSING(7) | The connection is closing |
| CLOSED(8) | The connection is closed |
Since there are several possible protocol states in which a request can time out, you can calculate the error code accordingly using the values in the table above.
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This section describes the error codes for endpoint failures. For more information on handling endpoint errors, see Endpoint Error Handling.
General errors
| Error Code | Detail |
| 303000 | Load Balance endpoint is not ready to connect |
| 303000 | Recipient List Endpoint is not ready |
| 303000 | Failover endpoint is not ready to connect |
| 303001 | Address Endpoint is not ready to connect |
| 303002 | WSDL Address is not ready to connect |
Failure on endpoint in the session
| Error Code | Detail |
| 309001 | Session aware load balance endpoint, No ready child endpoints |
| 309002 | Session aware load balance endpoint, Invalid reference |
| 309003 | Session aware load balance endpoint, Failed session |
Non-fatal warnings
| Error Code | Detail |
| 303100 | A failover occurred in a Load balance endpoint |
| 304100 | A failover occurred in a Failover endpoint |
Referring real endpoint is null
| Error Code | Detail |
| 305100 | Indirect endpoint not ready |
Callout operation failed
| Error Code | Detail |
| 401000 | Callout operation failed (from the callout mediator) |
| 401001 | Blocking call operation failed (from the Call mediator when you have enabled blocking in it). |
| 401002 | Blocking sender operation failed (from the Call mediator when you have enabled blocking in it). |
Custom error codes
| Error Code | Detail |
| 500000 | Endpoint Custom Error - This error is triggered when the endpoint is prefixed by |
| Info |
|---|
For information on best practices for handling errors in WSO2 ESB, see WSO2 ESB by Example - Best practices for error handling on the WSO2 ESB. |