Skip to main content

Generate a self-signed certificate for .NET Core

A team member contacted me because he no longer could invoke a local service he was developing. I had a look at the error message the API returned:

One or more errors occurred.
An error occurred while sending the request.
The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.
The remote certificate is invalid according to the validation procedure

This was a local service using a self-signed certificate and it turned out that the certificate was expired.

Time to create a new self-signed certificate…

Create a self-signed certificate using dotnet dev-certs

Generating a new self-signed certificate is easy in .NET Core thanks to the built-in support in the dotnet commandline tool.

Open a command prompt and execute the following command:

dotnet dev-certs https -ep c:\users\BaWu\localhost.pfx -p crypticpassword

Remark:  If the command returns the following response "A valid HTTPS certificate is already present.", a trusted certificate already exists in your store.

Import certificate in IIS

OK, almost there. A last step to get it working in IIS is to import our generated pfx in IIS:

  • Open IIS using inetmgr.
  • Go to Server Certificates.

image

  • Click on the Import… action on the right. The Import certificate screen is shown.

image

  • Select the pfx, specify the password and click OK.
  • Now that the certificate is available in IIS, you can change the bindings to use it. Click on the Default Web site(or any other site) on the left.
  • Click on the Bindings… action on the right. The Site Bindings screen is shown.

image

  • Click on the https item in the list and choose Edit… . The Edit Site Binding screen is shown.

image

  • Select the newly created SSL certificate from the list and click OK.
Labels:

Popular posts from this blog

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

DevToys–A swiss army knife for developers

As a developer there are a lot of small tasks you need to do as part of your coding, debugging and testing activities.  DevToys is an offline windows app that tries to help you with these tasks. Instead of using different websites you get a fully offline experience offering help for a large list of tasks. Many tools are available. Here is the current list: Converters JSON <> YAML Timestamp Number Base Cron Parser Encoders / Decoders HTML URL Base64 Text & Image GZip JWT Decoder Formatters JSON SQL XML Generators Hash (MD5, SHA1, SHA256, SHA512) UUID 1 and 4 Lorem Ipsum Checksum Text Escape / Unescape Inspector & Case Converter Regex Tester Text Comparer XML Validator Markdown Preview Graphic Col...
Read more