Cannot create HTTP client Exception in Http -- XI -- RFC scenario

Question

Hi,
We are testing Http --> XI --> RFC scenario
While testing this scenario from RWB we are getting following error message in the SXMB_MONI logs:
  <?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
- <!--  Call Adapter
  -->
- <SAP:Error xmlns:SAP="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_CREATE_FAILED</SAP:Code>
  <SAP:P1>1</SAP:P1>
  <SAP:P2 />
  <SAP:P3 />
  <SAP:P4 />
  <SAP:AdditionalText />
  <SAP:ApplicationFaultMessage namespace="" />
  <SAP:Stack>Cannot create HTTP client (exception 1)</SAP:Stack>
  <SAP:Retry>N</SAP:Retry>
  </SAP:Error>
Following is the info from the Trace:
  <Trace level="1" type="System_Error">cl_http_client exc = argument_not_found</Trace>
We have tried following things:
1. In SICF we made sure the /default_host/sap/xi/adapter_plain is active
2. Applied SAP Note: 716739
Any response will be greatly appreciated.
Thanks,
Paresh

Answer 1

Hi UDO,
Thanks for your reply. The error was gone when I tested again this morning. I am guessing it must be the SAP Note 716739 that we applied and might not have refreshed the cache.
I am still intereseted in confirming what exacly fixed this issue.
As per your suggestion, I looked at the left Nav bar and the error was at the "Call Adapter" step. Even in the log message it says the same. The reciever/interface determination and mapping were successfull. I could successfully test the scenario in the integration directory.
Here is what the 716739 Note said:
Symptom
If you call the Integration Server from a sending Integration Engine (proxy), the following error message occurs:
Category = XIServer
Area = INTERNAL
Id = CLIENT_CREATE_FAILED.
In transaction SXMB_ADM, you used the Configure Integration Engine function to enter a URL of the type http://<host>:<port>/sap/xi/engine?type=entry instead of a URL of the type dest://<name>.
Other terms
SICF, SXMB_MONI, SXMB_ADM, XI
Reason and Prerequisites
You have configured the communication route from the sending proxy (Integration Engine) to the Integration Server using the URL of the type
http://<host>:<port>/sap/xi/engine?type=entry and have saved the logon data on the Integration Server in the Service
/sap/xi/engine (transaction SICF).
A program error has occurred: the communication log is not correctly set when the HTTP client is set up.
Solution
The problem is eliminated with SAP_BASIS Support Package 2. To eliminate the problem, you can use an URL of the type dest://<name>, where <name>  refers to the name of a HTTP destination that you have maintained with transaction SM59.
Now, I was not using the proxies but Http post to XI. Do you guys also think this might have fixed my issue?
Thanks,
Paresh