Code 9124: Expected input credential was not present

[jimbo]

I have read every community question and response relating to this issue and am unable to resolve the issue.

My application is developed in C# using the sample application https://github.com/visa/SampleCode/tree/master/vdp-c-sharp

I followed this guide to create my P12 file:

https://github.com/visa/SampleCode/tree/master/vdp-c-sharp#usage

My request:

POST https://sandbox.api.visa.com/forexrates/v1/foreignexchangerates HTTP/1.1
Content-Type: application/json
Accept: application/json
Host: sandbox.api.visa.com
Authorization: Basic xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
ex-correlation-id: TNCCYZ0OTEB0_SC
Content-Length: 98
Connection: Keep-Alive

{
"destinationCurrencyCode": "USD",
"sourceAmount": 99.99,
"sourceCurrencyCode": "GBP"
}

Server response:

HTTP/1.1 400 Bad Request
Server: Apache
X-SERVED-BY: l73c002
X-CORRELATION-ID: 1530083786_691_84_l73c002_VDP_ARM
X-APP-STATUS: 400
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Strict-Transport-Security: max-age=2592000;includeSubdomains
Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Expires: -1
Content-Type: application/json;charset=UTF-8
Content-Length: 130
X-Cnection: close
X-Cnection: close
Date: Wed, 27 Jun 2018 07:16:26 GMT
Connection: close

{"responseStatus":{"code":"9124","severity":"ERROR","message":"Expected input credential was not present","info":"","status":400}}

Any assistance or trace information would be greatly appreciated.

[jimbo]

Further to the above information, using my P12 certificate and spoofing my request in SOAPUI I get a successful response which indicates that my issue is something to do with the HttpWebRequest object not sending the certificate back to Visa at the correct time?

[jimbo · Accepted solution]

Naughty Fiddler! I'm using Fiddler to inspect traffic, which interrupts the 2 Way Authentication and causes this error. As soon as I turn proxying off, the request succeeds.

There is an article on how to instruct Fiddler to reply with the client certificate when required here

https://docs.telerik.com/fiddler/Configure-Fiddler/Tasks/RespondWithClientCert

[API_Products]

Hi @jimbo,

Thanks for letting us know how you resolved the issue!