HTTP Error-403 while App Creation.

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Hi Dear Developer Team, Iam creating an app for appstore, We did first install in our demostore, the error we are getting is "HTTP 403 ERROR" as per below screen Please help to resolve this issue & details are below. Although it works fine in the browsers but its not working in shopify admin area only. We have configured the server settings to HTTPS but shopify is reading as HTTP. when we remove the parameter from the url from the iframe in admin area then the app is working fine in admin side. Please help to resolve this issue. Parameter is protocol=https

The App is still not published Yet.


Hostigator support team is still investigating but no use. Please help..

Server details:


Windows Shared Hosting (Enterprise Plan) 4.5, c# mvc platform.

SSL Certificate is Activated.

Error Screenshot: