The JeroenHD blog
The JeroenHD blog

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Let's Encrypt, DNS over TLS and Android

Because of the recent expiry of the certificate used to cross-sign Let's Encrypt certificates, Android gets confused when you try to use them for DoT.

Firefox for Android: using a custom certificate authority

How to use your own, self-generated certificate authorities in Firefox for Android

Jellyfin, rffmpeg and confusing error messages

Confusing error messages sent me on a debugging spree because of an interesting Jellyifn quirk.

TL;DR: if you have configured an alternative ffmpeg path in Jellyfin, make sure there's an ffprobe binary in the same location with the same file extension. In my case, this was solved by running:

ln -s `which ffprobe` /usr/local/bin/

Getting Norton Secure VPN to work on Linux

Norton Secure VPN is a paid VPN service that's packaged in Norton 360. Officially, only Windows, Mac, Android and iOS are supported, but the underlying protocol is OpenVPN so it can be made to work with any platform with enough effort!

Suddenly, WiFi

Turns out there's more to the Xbox One Wireless Adapter than I expected

Reader for Mobile and Wireless Networks 192620010 (2018/2019)

The course "Mobile and Wireless Networks" (given on University of Twente) requires students to buy a reader to read along. This reader consists of several chapters and papers from different authors which are available freely on the web. This page lists those chapters and paper so that you, as a student, can just find the papers yourself online instead of having to waste paper printing these articles.

The reader in question is:
Mobile & Wireless Networking (G. Heijenk)
Reader 018 (februari 2019)
Vakcode: 192620010

This blog just got a new lick of paint!

No longer is this blog bound by some standard theme. Now it is free and all material-design-y!

Android 7.1 and certificate authorities: unfortunately, I was being too pessimistic

I wrote a piece about Android 7 and its certificate authority system. Now that Android 7.1 has been released, most of the problems I predicted turn out to be nothing.

I think I'm starting to prefer Xubuntu...

I've noticed over the past weeks I've been using Xubuntu more than I have been using Windows. Why though?

Android 7 Nougat and certificate authorities

In this article I will cover some details about the way Android 7 "Nougat" treats user-installed certificate authorities. Android 7 improved security in many ways. However, this has several downsides... As an added bonus, I describe a way to install a certificate authority in Android 7 using root access.