The remote server returned an error: (403) Forbidden

Question

I\'ve written an app that has worked fine for months, in the last few days I\'ve been getting the error below on the installed version only.

If I run the source code

Answer 1

In my case, I had to call an API repeatedly in a loop, which resulted in halt of my system returning a 403 Forbidden Error. Since my API provider does not allow multiple requests from the same client within milliseconds, I had to use a delay of 1 second at least :

foreach (var it in list)
{
    Thread.Sleep(1000);
    // Call API
}