[SOLVED] QBWC: "Index Out Of Range" in do

QBWC: "Index Out Of Range" in do_authenticate()

I'm using QuickBooks WebConnector 2.2.0.71 and my WCF web service (on .NET 4.6.1). After pressing "Update selected" in WebConnector serverVersion and clientVersion requests successfully processed, but authenticate failed:

20170705.06:31:00 UTC   : QBWebConnector.SOAPWebService.do_authenticate() : *** Calling authenticate() with following parameters:<userName="username"><password=<MaskedForSecurity>
20170705.06:31:00 UTC   : QBWebConnector.SOAPWebService.do_authenticate() : QBWC1012: Authentication failed due to following error message.
Index Out Of Range.
More info:
StackTrace =    в QBWebConnector.WebService.do_authenticate(String& ticket, String& companyFileName)
Source = QBWebConnector

Response of my WCF service (from WCF Test Client):

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Header />
  <s:Body>
    <authenticateResponse xmlns="http://developer.intuit.com/">
      <authenticateResult xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
        <a:string>a3f10876-e027-419d-8dd8-3752a852ddae</a:string>
        <a:string>nvu</a:string>
        <a:string>3</a:string>
        <a:string>60</a:string>
        <a:string>60</a:string>
      </authenticateResult>
    </authenticateResponse>
  </s:Body>
</s:Envelope>

Docs says "Your callback must return A string array with 4 possible elements. The first element contains either NONE or NVU (invalid user) or BUSY., or empty string, or a string that is the QB company file name." but in samples first element is guid token, so I send array of 5 elements.

Same error occured when I send not an array, but int value, so I guess - maybe something wrong with my xml?

Solution

Solved by adding [XmlSerializerFormat] to IService, so responce become

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Header />
  <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <authenticateResponse xmlns="http://developer.intuit.com/">
      <authenticateResult>
        <string>d0297d33-859d-4259-a598-5fbf328bac3b</string>
        <string>nvu</string>
        <string>3</string>
        <string>60</string>
      </authenticateResult>
    </authenticateResponse>
  </s:Body>
</s:Envelope>