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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for May 3rd, 2022

capitaltg/thea: Certificate Checker and site

Posted by jpluimers on 2022/05/03

[Wayback/] capitaltg/thea: Certificate Checker

Certificate Checker provides an easy-to-use solution to check certificates, certificate chains, and TLS configurations. To run Certificate Checker for publicly-accessible web sites you can go to: and enter in there a URL to check.
Users can easily run Certificate Checker in an internal network to validate or troubleshoot their TLS configuration. To run it on a local network you can run the Docker image as described below. You can also build the application and deploy it on an existing server.

It runs on [Wayback/] Certificate Checker.

I used it to check various certificates and chains, including those for my GitHub Pages explained last week in Setting up a GitHub project so it is served over https as a custom subdomain.


Posted in Communications Development, Development, Encryption, HTTPS/TLS security, Internet protocol suite, Let's Encrypt (letsencrypt/certbot), Power User, Security, Software Development, TCP, TLS, Web Development | Leave a Comment »

Remotely controlling most Harman Kardon systems

Posted by jpluimers on 2022/05/03

There is a Harman Kardon Remote app on [Wayback/] Android and [Wayback/] iOS.

It can control Harman Kardon AVR and BDS devices, and the communication appears to be simple XML over HTTP according to [Wayback/] H/K AVR 151 Remote Control API – Adam Parsons.

It got reverse engineered into two libraries, both based on string concatenating XML HTTP requests:



Posted in Development, PHP, Scripting, Software Development | Leave a Comment »

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