Skip to main content

The request was aborted: could not create SSL/TLS secure channel–Part 1

A colleague asked for help with the following problem:

He has an ASP.NET MVC website that talks to an ASP.NET Web API backend. On development everything works as expected but on the acceptance environment, he suddenly start to get TLS errors when the httpclient invokes a call to the backend:

The request was aborted: Could not create SSL/TLS secure channel.

sslerror

Let’s take you through the journey that brought us to our final solution.

Part 1 – The unexpected .NET Framework update.

What we find especially strange was that it worked before, and that the errors only started to appear recently. This brought us on the path of what was recently changed. One of the things that happened was an upgrade to .NET Framework 4.6. Could it be?

In the .NET documentation we found that in .NET 4.6 the HttpClient defaults to TLS 1.2. Maybe that caused the error?

We updated our code to force the system to use TLS 1.0:

This worked but now we were using an older(less secure) TLS version. Let’s continue the investigation in another post…

Labels:

Popular posts from this blog

.NET 8–Keyed/Named Services

A feature that a lot of IoC container libraries support but that was missing in the default DI container provided by Microsoft is the support for Keyed or Named Services. This feature allows you to register the same type multiple times using different names, allowing you to resolve a specific instance based on the circumstances. Although there is some controversy if supporting this feature is a good idea or not, it certainly can be handy. To support this feature a new interface IKeyedServiceProvider got introduced in .NET 8 providing 2 new methods on our ServiceProvider instance: object? GetKeyedService(Type serviceType, object? serviceKey); object GetRequiredKeyedService(Type serviceType, object? serviceKey); To use it, we need to register our service using one of the new extension methods: Resolving the service can be done either through the FromKeyedServices attribute: or by injecting the IKeyedServiceProvider interface and calling the GetRequiredKeyedServic...
Read more

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.
Read more

Kubernetes–Limit your environmental impact

Reducing the carbon footprint and CO2 emission of our (cloud) workloads, is a responsibility of all of us. If you are running a Kubernetes cluster, have a look at Kube-Green . kube-green is a simple Kubernetes operator that automatically shuts down (some of) your pods when you don't need them. A single pod produces about 11 Kg CO2eq per year( here the calculation). Reason enough to give it a try! Installing kube-green in your cluster The easiest way to install the operator in your cluster is through kubectl. We first need to install a cert-manager: kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.5/cert-manager.yaml Remark: Wait a minute before you continue as it can take some time before the cert-manager is up & running inside your cluster. Now we can install the kube-green operator: kubectl apply -f https://github.com/kube-green/kube-green/releases/latest/download/kube-green.yaml Now in the namespace where we want t...
Read more