Manually Updating a Let’s Encrypt Certificate for an Azure Web App

If you are making use of a Let’s Encrypt certificate (see installation instructions here) to secure the connection to your Azure Web App this certificate should auto-renew every three months.

However, sometimes it does not. In that case follow the instructions below to renew the certificate manually.

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WDF_Violation after Installing Windows 10 Feature Update 1903 on a MacBook Pro 17″ Mid2010

I have been running Windows on my MacBook Pro 17″ Mid2010 for as long as I own this machine. It has been running trouble free for most of the time.

In June 2019 Windows 10 Feature Pack 1903 was available for installation on my MacBook. It installed painlessly, the MacBook booted, I entered my credentials and then after 15 seconds or so, just as the Windows Defender icon appeared in the notification area, …. it crashed with a blue screen of death telling me that a WDF violation had occurred!

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Installing Windows 10 on a MacBook Pro 17inch Mid2010

Preface

The MacBook Pro 17″ I bought in 2010 is still an amazing machine. Fun fact: it has been mentioned best Windows laptop in its days and I can 100% confirm. It runs Windows very smoothly, still today!

I decided it was time to install a fresh Windows 10 image on this machine and since I store my data in Office 365 SharePoint and I therefore have no data to worry about on this machine I reckoned this would be a rather painless exercise to do.

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How to Convert PEM Certificates to PFX Format

Sometimes a certificate is needed for demo or test purposes and there are several web sites which provide these for free. One of these sites is SSLforFree. When you let this site create all files for you (as opposed to providing a CSR) you will be provided with three files:

  1. Private.key. As the name implies this is the private key of the assymetric key pair. Never share this key for any other reason than importing it at the host you want to enable SSL on.
  2. Certificate.crt. This is the CA-signed public key.
  3. Ca_bundle.crt. This is the complete certificate chain to enable subjects to verify the validity of your certificate.
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Regenerating Self-Signed Certificates For a VMware ESXi Host

Introduction

I run a free VMware ESXi install on my Intel NUC at work. I mainly use this setup to deploy virtual machines for test and demo purposes. A self-signed certificate is by default available on VMware ESXi after installation.

I noticed that the FQDN of my host did not match the CN of the currently installed self-signed certificate (see the red markings on the figure below).

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How to Install a Free Public CA Certificate on a VMware ESXi Host

Introduction

I run a free VMware ESXi install on my Intel NUC at work. I mainly use this setup to run virtual machines for test and demo purposes. Up until now I used non-encrypted connections to the ESXi management console but I decided to use encrypted remote connections. Although a self signed certificate is by default available on the VMware ESXi install I wanted to use and install a new certificate that is signed by a valid public certificate authority.

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