I'm aware, that this exceptions are discussed in several other threads, but I can't get mine to work. My environment: I Have a ASP.NET Core REST-API (let's call it A), which calls another REST-API (let's call it B). Working with these two APIs, I have a Server in the internal network and my local development environment, also making use of Postman. Trying out the combiniations, I have the following behavior:
- Local A calls local B --> Works
- Local A calls Server B --> Error
- Postman calls Server B --> Works
- Server A calls Server B --> Error
Calls to A work locally and on the Server.
The error I get:
{System.Net.WebException: An error occurred while sending the request. A security error occurred ---> System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.Http.WinHttpException: A security error occurred at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at
Looking deeper, the most inner exception is
"A security error occurred"
If I didn't use Postman, I would just assume, that something regarding the IIS on the Server, where B is running. But since Postman can in fact work with it, this doesn't seem to be the problem. Also, since everything is running fine on the local environment, there has to be something on the server. Intereresting enough, A and B are running on the same one.
