HTTP Proxy Connection for sharepoint-webservice endpoint in SMP

hi all,
I want to consume share-point services(soap based) through SMP. for that i am creating HTTP Proxy Connection for sharepoint web service endpoint in
SMP. i have done with creation of proxy connection without any error but while testing (on REST_CLIENT add-ons) it showing following error :
Status Code: 400 <?xml version="1.0" encoding="utf-8"?> <error ><message xml:lang="en">Error occurred while connecting to the Gatewaynull</message> </error>
Can anyone help me....
Thanks in advance.

hii Andrew,
Here are screenshots of proxy connection configuration,
security configuration:
Application creation:
connection white listing :
Error message in Rest Client:
Regards,
SupriyaD

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Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
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