402 Error CLIENT_RECEIVE_FAILED

I build a prcess which contain RFC to get the response of

Z_ARIBA_INVOICE_STATUS_UPDATE

but i get system error as below:

<?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>XIServer</SAP:Category>

<SAP:Code area="INTERNAL">CLIENT_RECEIVE_FAILED</SAP:Code>

<SAP:P1>402</SAP:P1>

<SAP:P2>ICM_HTTP_TIMEOUT</SAP:P2>

<SAP:P3 />

<SAP:P4 />

SAP Web Application Server Help" target="_blank">http://help.sap.com/">Help  

500 Connection timed out

Connection timed out (-5)

---

Error: -5 Version: 6040 Component: ICM Date/Time: Wed Mar 22 17:00:15 2006 Module: icxxthr.c Line: 2563 Server: DL380A-WM_ARB_00 Detail: Connection to partner timed out

©" target="_blank">http://www.sap.com/">©; 2001-2003, SAP AG

<SAP:ApplicationFaultMessage namespace="" />

<SAP:Stack>Error when receiving by HTTP (error code: 402, error text: ICM_HTTP_TIMEOUT)</SAP:Stack>

<SAP:Retry>N</SAP:Retry>

</SAP:Error>

Is there something wrong in my ID or IR, or other things?

Thank you for your reply