Author Archives

IT/OT Network Architect • Security Technology Specialist • ICT Manager • Amateur Radio Operator

• Quieting the Beast – Replacing Fans in an Eaton UPS

  By Sebastian Storholm on October 1, 2022 • ( 3 )

  

  As most of my European readers are keenly aware, the current energy situation in Europe is rather precarious. Rolling blackouts are something that might need to be implemented to keep the grid operational during the coming winter months. While this… Read More ›

• Extending Disks on a Linux Virtual Machine

  By Sebastian Storholm on August 31, 2021 • ( 2 )

  

  If you’ve done any work with virtual machines for any amount of time, you’ve probably ran into the problem that virtual machines tend to fill up their disks quite rapidly. On a Windows VM it usually isn’t a problem, since… Read More ›

• Vespa Parts Index

  By Sebastian Storholm on March 25, 2021 • ( 0 )

  

  When you’re working on your vintage Vespa, it’s good sometimes to know the exact dimensions of bearings, seals and o-rings if you need to source one locally. Below is an index of all the parts I’ve identified so far, along… Read More ›

• Trusted Root Certificate Authorities Missing from Domain Controllers?

  By Sebastian Storholm on January 25, 2021 • ( 0 )

  

  Today I ran into a peculiar issue when configuring a GPO policy for 802.1X authentication with WPA2-Enterprise. When you use PEAP for authentication, you need to assign which Certificate Authorities’ (CAs) certificates will be accepted for authentication. I went to… Read More ›

• Generating Certificate Signing Requests using OpenSSL

  By Sebastian Storholm on October 29, 2020 • ( 0 )

  

  Requesting SSL Certificates can be a bit of a hassle, so today I’m going to show you how to easily generate SSL certificates with the help of OpenSSL and your CA of choice.

• Disabling Insecure Ciphers on NGINX – NGINX Tricks Part 4

  By Sebastian Storholm on April 22, 2020 • ( 0 )

  

  HTTPS is everywhere these days, but not many people think that much about which cipher suites are considered safe. Cipher suites determines what encryption algorithms are used to secure the communication over HTTPS, and as time goes on older cipher… Read More ›

• Adding Custom Root CA Certificates to Debian

  By Sebastian Storholm on February 25, 2020 • ( 4 )

  

  Adding custom root CA certificates to Debian is rather easy, but there are some non-obvious pitfalls that you might encounter. Here I’ve tried to collect most things to a single post for your convenience. Adding Custom Root CA Certificates Debian… Read More ›

• Office 365 – Changing User’s Principal Name

  By Sebastian Storholm on February 13, 2020 • ( 0 )

  

  A quite common occurrence for IT admins is that people change their names, and thus need their username to reflect this change. In the good ol’ days, this wasn’t an issue, just change their name in AD in 15 different… Read More ›

• Fixing SSL Labs Grade on F5 Big-IP – Enabling HSTS

  By Sebastian Storholm on November 25, 2019 • ( 0 )

  

  This week, we’re going for the gold medal, that sweet sweet A+ grade on Qualys SSL Labs. And to achieve this lofty goal of ours, we’ll need to enable one thing, HSTS. This is no small task, and for the… Read More ›

• Fixing SSL Labs Grade on F5 Big-IP – Custom Cipher Groups

  By Sebastian Storholm on November 18, 2019 • ( 9 )

  

  As promised in my last post on F5 load-balancers, this weeks issue of the never-ending guide on how to keep your F5 Big-IPs in the good graces of Qualys SSL Labs will deal with TLSv1.3 demanding that we use cipher… Read More ›