connection refused message

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hello

I am trying to run a sync interface RFC2WS.

I recieve the message and in the response I recieve this message:

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>

- <!-- Call Adapter

-->

- http://sap.com/xi/XI/Message/30" xmlns:SOAP=" http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="1">

<SAP:Category>XIAdapterFramework</SAP:Category>

<SAP:Code area="MESSAGE">GENERAL</SAP:Code>

<SAP:P1 />

<SAP:P2 />

<SAP:P3 />

<SAP:P4 />

<SAP:AdditionalText>com.sap.aii.af.ra.ms.api.DeliveryException: Connection refused: connect</SAP:AdditionalText>

<SAP:ApplicationFaultMessage namespace="" />

<SAP:Stack />

<SAP:Retry>M</SAP:Retry>

</SAP:Error>

in the comm. channel I recieve a familiar Q,

24.03.2008 08:18:00 Error SOAP: error occured: com.sap.aii.af.ra.ms.api.RecoverableException: Connection refused: connect: java.net.ConnectException: Connection refused: connect

24.03.2008 08:18:00 Error MP: Exception caught with cause com.sap.aii.af.ra.ms.api.RecoverableException: Connection refused: connect: java.net.ConnectException: Connection refused: connect

24.03.2008 08:18:00 Error Exception caught by adapter framework: Connection refused: connect

24.03.2008 08:18:00 Error Delivery of the message to the application using connection SOAP_http://sap.com/xi/XI/System failed, due to: com.sap.aii.af.ra.ms.api.RecoverableException: Connection refused: connect: java.net.ConnectException: Connection refused: connect. Setting message to status failed.

24.03.2008 08:18:00 Error The message status set to FAIL.

24.03.2008 08:18:00 Error Returning synchronous error message to calling application: com.sap.aii.af.ra.ms.api.RecoverableException: Connection refused: connect: java.net.ConnectException: Connection refused: connect.

I am trying to get to the root of the problem, and from what I know, the problem is not in the XI.

what else can I check in order to be sure that the problem is not in the XI? how can I know exactly where the problem is?

Thanks

Kfir