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SMTP XOAUTH2 deep dive

Using XOAUTH2 for SMTP is new, but how does it work? Let's have a look. Read more...

Use SMTP with XOAUTH2 on Microsoft 365/Exchange Online with a service principal

Service principals in Microsoft 365/Exchange Online can be used to send mails via SMTP. This requires XOAUTH2 authentication in the SMTP protocol. Preparing your service principal can be hard. Read more...

3CX: How to forward an extension to a call flow app

In 3CX it is possible to forward calls to another extension, IVR or queue when the extension status is away, DND, lunch, etc. But selecting an CDF is not possible. This guide explains how this is still possible. Read more...

How to fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH

When connecting to and old device you get an ERR_SSL_VERSION_OR_CIPHER_MISMATCH theire is no fix but an workaround that I will explain in this article. Read more...

Factory reset Gigaset Maxwell phone without password

How to reset a Gigaset Maxwell phone without password via tftp Read more...

Creating a PFX certificate from a PEM certificate including the CA Bundle

Some platforms (like IIS and Azure Application Gateway) require certificates in PFX (PKCS#12) format. In this guide you will learn how to convert your .pem, .crt of .cert certificate in a .pfx file. Read more...

How to fix SFTP: Unable to negotiate with ...: no matching cipher found

Recently I needed to connect to a SFTP server in a company to download export files. Because the SFTP client was unable to negotiate with and no matching cipher found. Read more...

Accessing the Keycloak H2 database

How to access the built-in Keycloak H2 database Read more...

How to recover files with Linux from a Bitlocker drive

Due to hardware failure Windows became very unstable. I wanted to recover the files using a Live Linux USB thumbdrive. But all my volumes are encrypted with Bitlocker. A quick how to. Read more...

How to fix ffmpeg.dll was not found when (re)installing Microsoft Teams

After reinstalling Office the Microsoft Teams desktop client was missing. When I tried to download and install it I got stuck on the error that ffmpeg.dll was missing. Read more...

How to fix curl: (35) error:1425F102:SSL routines:ssl_choose_client_version:unsupported protocol

Recently I had a stange situation. With my browser I was able to open the health check of a legacy webservice but curl was unable to reach it. Read more...

Find the supported SSL version for an endpoint using the OpenSSL command

Find which SSL/TLS version is supported for an SSL server (https, imaps, ftps, ...) with OpenSSL Read more...

Upgrade Windows Server Evaluation naar normale Windows Server geactiveerd met VLK/MAK

Heb je Windows Server Evaluation geinstalleerd en wil je deze activeren met een VLK/MAK sleutel dan zul je merken dat dit niet direct kan. Lees verder...

Tunnelen met SSH

Stap voor stap uitleg over het opzetten van verschillende soorten SSH tunnel. Gebruik een SSH server als proxy. Lees verder...

Vervangen certificaat in PFX-bestand

Een PFX bestand bevat een certificaat en de private key. Als je een certificaat verlengd krijg je deze doorgaans als PEM file opgestuurd. Hier leg ik je uit hoe je eenvoudig het nieuwe certificaat in het PFX bestand zet (met behoud van de private key). Lees verder...

PHP development onder Windows met IIS

Windows komt standaard met een prima webserver (Internet Information Services) waarmee je gemakkelijk meerdere PHP versie kunt draaien. Lees verder...

Use entity validation annotations in non mapped form fields

Learn how to use the same validation annotations that you used in your entity class for non mapped form fields. Read more...

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