Plain HTTP adapter error: Bad Gateway, Proxy Error, please help !

hello all,
i have the following scenario:
filesystem->file adapter->XI->plain http adapter-> receiver system.
the following error occurred while calling plain http adapter:
<SAP:Category>XIAdapter</SAP:Category>
<SAP:Code area="PLAINHTTP_ADAPTER">ATTRIBUTE_Server</SAP:Code>
<SAP:P1>502</SAP:P1>
<SAP:P2>Bad Gateway</SAP:P2>
<SAP:P3> Proxy Error</SAP:P3>
<SAP:P4 />
<SAP:AdditionalText />
<SAP:ApplicationFaultMessage namespace="" />
<SAP:Stack>HTTP-Server Code 502 Reason Bad Gateway Explanation Proxy Error</SAP:Stack>
A RFC-Destination with SSL is used in this scenario. Connection test to the destination machine is also succeeded. some files have been transported to the receiver system, yet without payload. data is lost.
anyone has encountered such problem or anybody can tell me please how to solve this problem.
thanks for your help
regards

Hi,
I´ve found a SAP-Note concerning this error-message 692057
There is the note 450226 gives an overview over error codes
Probably below solution may help you.........
As an administrator on your portal go to:
System Configuration > Service Configuration >applications
Under: com.sap.portal.ivs.httpservice > Services > Proxy
If any proxy settings are configured you may end up with the problem, so you need to set the "nonProxyHosts" to include the trex host.
After a restart the search was working normally again.
Thanks
Swarup

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<SAP:Error xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="">
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<SAP:P3>Internal Server Error</SAP:P3>
<SAP:P4 />
<SAP:AdditionalText />
<SAP:ApplicationFaultMessage namespace="" />
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Thanks for your reply.
Unfortunately, your thread didn't help me.
Let me to explain the problem more detail.
The error occurs on outbound channel when Integration Engine is calling the plain HTTP adapter. I think so because no messages appear in Adapter Engine (For check it I use Message Display Tool).
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<SAP:Error xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="">
<SAP:Category>XIAdapter</SAP:Category>
<SAP:Code area="PLAINHTTP_ADAPTER">ATTRIBUTE_SERVER</SAP:Code>
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<SAP:P2>Not Found</SAP:P2>
<SAP:P3>File not found</SAP:P3>
<SAP:P4 />
<SAP:AdditionalText />
<SAP:ApplicationFaultMessage namespace="" />
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[http://image-upload.de/image/Rv3NeE/77c11c84fc.jpeg]
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[http://image-upload.de/image/5Z2Gwr/90c19f2074.jpeg]
[http://image-upload.de/image/hGrzQL/559bf5e566.jpeg]
[http://image-upload.de/image/2WqCqz/7513a1a366.jpeg]

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