ESET – XMAS Special 2022
Auch dieses Jahr gibt es wieder ein ganz besonderes Special [...]
CrowdSec – The better Fail2Ban
Today, we're having a closer look at "Crowdsec" which [...]
Homeoffice Tipps für Führungskräfte
Gefühlt ein Viertel der Nation arbeitet nun aufgrund der COVID-19 [...]
HomeOffice – Tipps für Firmen während der Corona Krise
Aufgrund der allgegenwärtigen Corona Pandemie empfiehlt der bayrische Staat, Mitarbeiter [...]
Dovecot 2.3 “Couldn’t parse DH parameters”
After an aptitude update on dovecot to version 2.3.4 our mailcluster suddently stopped working with the following error in the dovecot.log.
Icingaweb2 claims that “Backend icinga2-ido is not running”
We recently had quite some issues with my a customers icinga2 installation, where icingaweb2 was constantly complaining about the IDO Backend is not running. The setup was as follows: icinga2 + icingaweb2 was running on server „webnode.local“ icinga2 database and icingaweb2 databases were on „database.local“.
Certificate Authority Authorization (CAA)
Ok, since Chrome68 the world has become a little more secure (treating http as insecure and enforcing certificate transparency).But now there's still one topic that could really offend you nicely secured server stack.
Enable DKIM (DomainKeys Identified Mail) & DMARC Domain-based Message Authentication, Reporting and Conformance
SPF is quite good - DKIM is better, use both to become best and then, enable DMARC ;) Please read our article regarding SPF enabling, since we require this to be enabled to follow those steps.
LetsEncrypt Wildcard Certificate using certbot
How to use Certbot to c reate LetsEncrypt Wildcard Certificates using ACME API version 2: Here's my documentation on how i got my wildcard working from Letsencrypt via the newly released API v2. Please note that we already got the backported certbot version installed on our servers!
Debian9 / stretch – disable mouse in vim
For those who are working with the newest Debian version and are used to work along with the vim editor, the auto-enabled mouse behaviour might be quite offending. At least for me, it was, that's why was looking for a solution to turn off the mouse constantly.