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Sovereign ACME certificates for Mailcow with Caddy and SNI
Mailcow:dockerized relies heavily on certificates with multiple names (SAN, Subject Alternative Name). This limits the choice of ACME providers, especially free ones. Here is way to change to a European Certificate Authority (CA).
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Domains for Digital Sovereignty
Whether digital services work for you is no longer independent of where these services are operating from. This also applies to the Internet Domains. Here is a table of country dependencies of all the 1595 top-level domains.
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Autistici/Inventati Sanctions Status
This documents the current WHOIS and DNS status of the autistici.org domain and their seemingly conflicting message as of 2026-09-05.
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Intel BE201: Getting Bluetooth to work on my Vivobook 14 Flip with Linux
While trying to connect a Bluetooth device to my Asus Vivobook 14 Flip running under Debian Trixie, I noticed that Bluetooth did not work. Here’s an easy way to fix it.
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Tablet mode unrecognized on Asus Vivobook 14 Flip under Linux: Workaround
My recently purchased Asus Vivobook 14 Flip (TP3407SA) does not flip into tablet (aka “slate”) mode when flipping the lid over. Here is a workaround for Gnome under Debian Trixie.
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No sound on Asus Vivobook 14 Flip under Linux: Fixed
I recently purchased an Asus Vivobook 14 Flip (Model TP3407SA) for use under Linux. One of the obstacles I ran into: Playing sounds resulted in no audio, the device remained mute. However, it had worked under Windows. Time to investigate.
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Obtaining TLS certificate information on the command line
Here are a few helpful commands if you want to inspect and dump certificates for analysis or debugging:
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50 years of microprocessor trend data
I recently wrote a (German) article including this graphic (in German). Here is an English version of it. Have fun!
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Compact Archive for WordPress
The default WordPress «Archive» block becomes very long and narrow, when months accumulate. Here is an easy way to make it more compact.
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DEFCON Voting Village 23 Panel
There was a DEFCON Voting Village panel «If I can shop online, why can’t I vote online?» which I found extremely important to read or listen to. Not just for me, in fact, for anyone talking about electronic voting. Here is a transcript for those who prefer reading (or searching for keywords).