David Stein

Project – FireSMS – Dockerized sending SMS by GSM modem

26/07/2025 / FireSMS, IT, My projects

FireSMS https://github.com/Fires04/FireSMS FireSMS is a Dockerized SMS Gateway built using Gammu SMSD and a custom API interface. It allows sending and receiving SMS messages using a GSM/USB modem connected to your server. FireSMS is ideal for IoT devices, alerting systems, or SMS-based applications. 📦 Features 🧱 Project Structure 🚀 Getting Started 1. Clone the Repository git clone https://github.com/Fires04/FireSMS.git […]

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Zabbix – usefull tips and commands

20/07/2025 / IT, Zabbix

Testing triggers If you need to test the Zabbix notification or response for specific alert severity, here is a little walkthrough on how you can do it easy way. First, create the new host in Zabbix web interface. Fill only the hostname. Then, create a new item under the newly created host. Fill the name,

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TL;DR – Zabbix docker compose upgrade

20/07/2025 / IT, Linux, Zabbix

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Migrate Microsoft domain controller (DC)

16/06/2025 / IT, Tutorials, Windows

Upgrading your Active Directory infrastructure isn’t a trivial task—but by following Microsoft’s recommended approach, you can migrate Domain Controllers (DCs) smoothly and securely. Here’s a clean, step-by-step guide to help you transition from Windows Server 2012 R2 DCs to fresh 2019 servers with minimal downtime. 1. Verify and Clean Up Current Environment 2. Stand Up a New

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TeamViewer – API get list of old devices

28/05/2025 / Internet, IT, Programming, Tutorials

If you are facing the limit of the maximum number of devices under your TeamViewer license, it is very helpful to get a list of all devices that have not been connected for a long time. 1. Prepare the API Token 2. Python Script Replace TEAMVIEWER_API_TOKEN with your actual token. After you run the script,

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FFmpeg – merge videos to timelapse

28/05/2025 / IT, Tutorials, Uncategorized

How to Create a Timelapse Video from Multiple Clips Using FFmpeg (with GPU Acceleration!) Do you have a folder full of video clips and want to create a smooth, fast-paced timelapse video from them—without expensive software? With FFmpeg, a free and powerful command-line tool, you can do just that. In this post, we’ll cover: 🛠️

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MS Office login error after motherboard replacement

09/04/2025 / Tutorials, Windows

After migrating the OS to different hardware, the stored keys in the TPM are lost. In this case, it is not possible to sign in to M365 applications, and the guaranteed solution is as follows: to:

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ISP Config – website password protection

15/01/2025 / Internet, IT, Networking, Tutorials

Sometimes, you must protect your site in ISPConfig with a standard pass or HTTP auth. Here are a few easy steps to do it. I will describe it from the administrator’s view. The manual is for the apache2 server. Now, after you try to access the website there will be an auth dialog.

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Auto Provisioning for Yealink IP Phone with MAC Started with 805EC0

19/12/2024 / Uncategorized

The old VoIP gateways from Yealink have problems with the autodiscovery web interface. The new devices from Yealink have a new MAC address segment and start with 805EC0. If you want to add the devices with new MAC prefixes you can use the google chrome developer console to “hack” the javascript what validates the MAC

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Can’t access DELL idrac remotely – Access Error 400

01/11/2024 / Internet, IT, Tutorials

Some IDRAC versions limit access to the web interface to a limited list of addresses. Accessing the IDRAC over the public IP and network NAT is a problem in this case. Usually, you get the error Access Error: 400 – Bad request. The problem is the IDRAC check the HTTPS Host header check introduced by

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