About me

Assisting companies with broad security analysis, securing and hardening their servers and networks, setting up complete SIEM environments. I set up controls and analyze business processes.

The buzz words: Siem consultant, Certified Information Security Manager (CISM), Offensive Security Certified Professional (OSCP), Certified Information Systems Security Professional (CISSP), Certified in Risk and Information Control (CRISC), primarily focused on Micro Focus ArcSight, with deep knowledge of Linux systems (Red Hat / RHEL). ArcSight trainer for Advanced Analyst, Advanced Admin and Logger courses. Trained in LogRhythm, Palo Alto, Splunk and VMware.

I use this web site as a blog for things I find that may help other people.

Newest posts

• Python upgrade venv python binary/version
• Git use different ssh key once
• TASK ERROR: zfs error: could not find any snapshots to destroy; check snapshot names.
  Try this: It will give an error but will remove snap from GUI
• Upgrade postgresql cluster from 13 to 15
• Upgrade debian 11 to 12
• Elasticsearch start fail on debian 11 after install from ES repos
  This guide helped me a lot: https://techviewleo.com/install-elastic-stack-elk-8-on-ubuntu/ After first installing with this parameter: I then … Read more
• Add a simple password to apache site
  To add a password to your site:
• Linux: add user to existing group
  To add an existing user to an existing Linux group:
• Mikrotik RouterOS guest VLAN routed over ProtonVPN (2023)
  That should work. Relevant config (first part (wireguard interface) does not have privkey, remember to … Read more
• SSH in for loop (consuming stdin / using file descriptor 3)
  Ever found yourself using a for/while loop using SSH in the loop, only to find … Read more
• Bash clear tmp files (for script) on exit (trap)
• Apache2 (apache) forward https headers
• Postgres read long lines (wrap text)
• Install `strings` command in debian/linux
  That’s a difficult one to search for. To get the strings command working in Debian … Read more
• SSH jump host config
  My remote hosts are on srvXX.remote.com. I have a jump host jump.remote.com. I want to … Read more
• Wireguard site-to-site (proxmox to mikrotik/routeros)
  I wanted to connect my dedicated hetzner proxmox box (“remote“) to my home IP. Networks: … Read more
• Masquerade ip forward for Proxmox on hetzner (single IP)
  This works for me: Then open SSH and edit /etc/network/interfaces: Then when creating a container: … Read more
• Proxmox migrate to node outside of cluster
• Fix “Cannot remove image, a guest with VMID ‘xxx’ exists!”
  Get this error? Cannot remove image, a guest with VMID ‘1070’ exists!You can delete the … Read more
• Add Microsoft fonts (like Arial) to Nextcloud Office (Collabora)
  On Debian 11:
• Proxmox move progress (container/VM)
  Your proxmox will just tell you: 2023-03-26 10:31:50 Logical volume “vm-1070-disk-1” created. But what if … Read more
• Proxmox move container/vm to different storage on different host
  Container: nohup pct migrate 1076 srv78 –target-storage LVMStore & Untested (VM): qm migrate 1076 srv78 … Read more
• LineageOS recovery bootloop into Google firmware
  Don’t follow the original guide You need to boot dtbo and boot too. Thanks to: … Read more
• Add new dmraid to debian11
  Note to self:
• Nextcloud / php / apache no error for Internal Server Error
  I got this: If you want to know more, enable log_errors
• Proxmox LXC container disk shrink
  Like this (LVM based)
• Friendly (ionice/nice) rsync on remote server
  Add –rsync-path=”ionice -c 3 nice rsync” to your rsync command (on sending side) Friendly for … Read more
• LVM commands not found
  Getting this? Means you might have used su. Just do su – or do a … Read more
• T-Mobile Thuis werkende SMTP 2023 (Fix Relay access denied)
  Ik kreeg de melding: Postfix moet net ff anders worden ingesteld. Dit werkt voor mij: … Read more
• Upgrade to debian11 from 10
  Then update, apt full-upgrade reboot