Try to troubleshooting QuickBook's Web Connector by following helping URL: Click Me. When I try to Add an application into Web connector getting following error: "QBWC1048: QuickBooks Web Connector could not verify the web application server certificate. QBWC1051: The new application was not added"

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2 Answers
QuickBook throws the 1048 error because it is unable to complete a GET request at the AppURL that specified QBFS.qwc file. This is because test.developer.intuit.com restricts GET requests via the SOAP API.
To get around this, include a parameter in the .qwc file, and set it to the same value as your AppURL without the URL path. For example, if your AppURL is https://mycompany.cs1.force.com/services/Soap/class/myApiClass, then set CertURL to https://mycompany.cs1.force.com.
This is the solution suggested by the QBWC log file, and it worked for me.

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1I was able to add a `GET` method with the same URL that my SOAP method (which uses `POST`) was listening to. This fixed the problem. – LStarky Nov 12 '20 at 03:11
I found I had this problem because my software was trying to load the file
http://developer.intuit.com/uploadedFiles/Support/QBWebConnectorSvc.wsdl
which no longer exists. :(
So I got a WSDL from
https://test.developer.intuit.com/QBWC/TroubleshootWebServiceFS/Service.asmx?wsdl
and put it in my Site's root directory, then changed my code to point there, and it worked.

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