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Note how the ERROR_MESSAGE property is being used to get the error message text. If you want to customize the error message that is sent back to the client, you can use the makefault mediator as demonstrated in Sample 5: Creating SOAP Fault Messages and Changing the Direction of a Message.

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

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)

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.

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