Knowledge base
tips & tricks
Set system time automatically on Linux
Introduction It is possibly to set and synchronize the time in Linux automatically through the s...
Linux Tips and Tricks
Set system time automatically
Introduction It is possibly to set and synchronize the time in Linux automatically through the ...
Set correct Timezone
Howto set the correct timezone in Linux Ubuntu Get all possible timezones: timedatectl list-...
Flush DNS Cache Unbuntu
Introduction Ubuntu caches DNS queries local. As long as the DNS address of a node does not chan...
Start / Stop /Restart BIND DNS Server
Introduction For testing purposes I am using Univention with bind9. The greater goal is to use A...
Hardening of Linux
Introduction Despite the fact that Linux is Open Source and Linux it comes as a surprise that in...
Tutorial on ufw
UFW, or Uncomplicated Firewall, is a simplified firewall management interface that hides the comp...
Fix Error fwupd-refresh
Introduction After installing monitoring (check_mk) I realized that the servis fwupd-refresh pro...
Enable ssh login with a public key
Introduction it is more secure and easier to login to a server over ssh if you place your publ...
Mount SAMBA shares
Introduction There a several ways of mounting SAMBA shares on a Linux machine. This manual gives...
Check for open ports
https://phoenixnap.com/kb/linux-check-open-ports lsof -nP -iTCP -sTCP:LISTEN netstat -tunpl...
Network browsing not working
Sometimes network browsing or the mapping of a SMB share with a file manager in Linux is not work...
Display IP address on Panel in Xfce
Create a small shell script show_ip.sh : #!/bin/bash # Get all addresses from hostname -I ...
Biometrics: Fingerprint
Introduction Enabling fingerprint login is quite simple on Fedora, hence all necessary software ...
Disable SELinux on Fedora
Permanently Disable SELinux on Fedora Update the SELinux configuration file and set SELINUX=disa...
Create boot USB
sudo lsblk sudo dd if=./Fedora-KDE-Live-x86_64-41-1.4.iso of=/dev/sdb bs=4M status=progress of...
Install PVE-VDIClient on Arch Linux
Introduction This VDI client connects directly to Proxmox VE and allows users to connect (via Sp...
Install network scanner on Archlinux
Install the drivers with pamac run the commandline: sudo brsaneconfig4 -a name=Brother model=MF...
Install xrdp
Introduction Fedora sudo dnf install -y xrdp xorgxrdp sudo systemctl enable xrdp sudo systemc...
Install Cockpit and Firewalld on Debian 12
Install Cockpit, Firewalld, and Open Ports on Debian 12 1. Update the System sudo apt update s...
Install xrdp on Fedora 42
How to Set Up XRDP on Fedora 42 XFCE Follow these steps for a reliable and quick XRDP setup with...
Install send mail service on Fedora
Fedora: Install and Configure Authenticated Mail Sending with msmtp and s-nail Overview This gu...
Add E-Mail account to MS Outlook
Introduction Microsoft 365, Azure or Exchange Server uses a proprietary protocol for E-Mail, Cal...
Add M365 account to Apple Mail
Introduction Microsoft 365, Azure or Exchange Server uses a proprietary protocol for E-Mail, Cal...
MacOS Tips & Tricks
How to Disable SIP
Introduction System Integrity Protection (SIP) SIP protects MacOS from cyber attacks. However, ...
Boot into recovery mode
Intel based Reboot and press: Command-R: Start up from the built-in macOS Recovery System. Us...
MacOS - Flush DNS Cache
Introduction For some reasons Apple nurses a bug in the DNS resolver. This leads to the problem,...
MacOS - Privacy hint / OCSP patch
Introduction The Online Certificate Status Protocol (OCSP) is an Internet protocol used for obta...
Map a shared drive on MacOS
Introduction Mapping of network drive seems to be a big issue. Hopefully this manual brings a li...
Proxmox Virtual Environment - PVE
PVE - VM does not stop
Introduction Sometimes a virtual machine cannot be stopped from the GUI. Resolution qm stop <n...
PVE - No quorum error
Introduction A typical error on a PVE cluster is No Quorum error It can happen, when other mac...
PVE - Can't lock file
Can't lock file https://dannyda.com/2020/05/1 1/how-to-fix-proxmox-pve-cant-lock-file-var-lock-q...
Import the voyager Root Certificate into your system
Introduction To ease the use of servers/services of this domain it is recommended to trust the r...
Add custom certificates to Apache
Introduction In numerous cases you want to enable https on a webserver like Apache. So I decid...
Add metager as search engine to your browser
Introduction MetaGer is a meta-search engine focused on protecting users' privacy. Based in Germ...
Thunderbird
CSA Webflow
Manual installation of WinBox
WinBox Winbox is a very useful application from mikrotik for the purpose to manage their devices...
Vivaldi - HSTS problem
vivaldi:net-internals/#hsts