As the headline says, it’s all about port scanning today. When a computer sends SYN to another computer, the remote computer will usually answer with SYN + ACK or RST. By this […]
I’ve experienced that many people deliberately disable the Windows firewall. They don’t want to get annoyed with it, if something don’t work as expected. But there’s nothing to worry about, because it […]
Firewalls control traffic. They use technology such as Stateful Inspection to establish a connection to other networks. In this article I describe how to configure the host-based Windows Firewall by using Windows […]
Microsoft Advanced Threat Analytics (ATA) is a platform that enables you to protect your infrastructure from cyber attacks. ATA is using a parsing engine to capture network traffic of protocols such as […]
Will you be notified when there are changes to group memberships? No? Memberships in groups are particularly interesting. Especially if it is the group of the domain administrators. The following article shows […]
What if a domain controller fails? Operations Masters have special tasks which must be performed by Domain Controllers in an Active Directory domain. If a Domain Controller fails, this special role must […]
There is more than enough monitoring software around. Most of them are really helpful and superbly done. For those who don’t have such software at hand, there are only 2 options: to do […]
Long time ago I’ve created a small function that acts like a port scanner. It’s not a replacement for enterprise scanners such as nmap, but it’s quite useful for quick tests when […]
In this article I would like to enlight the purpose of temporary IPv6 addresses. By default, automatic IPv6 setup of Link-Local Addresses is activated on each IPv6 enabled device. This makes IPv6 […]
Access based enumeration enables you to configure advanced display options for shared folders. If a user is mapped to a network drive and this network drive has the Access Based Enumeration Feature […]
Most of us use https. Almost every communication is secured and encrypted with https. In this article I would like to discuss the HTTPS process in more detail and what role certificates […]
VLANs are used for Layer 2 logical segmentation. Each VLAN forms its own broadcast domain. Communication between VLANs is only possible by a router, such as a Layer 3 Switch or a […]
There are many encryption and decryption tools around. PowerShell is a Windows built-in tool and you can use it for cryptography as well. In this blog post I am going to play […]
In this article, a certificate for a digital signature is created to digitally sign files with Windows PowerShell. A digital certificate is usually issued by a Certification Authority (CA). But in this […]
For some reason, I don’t like netstat. Never did. Fortunately PowerShell provides a similar command to netstat: Get-NetTCPConnection. Let’s discover the options of this command in form of this blog post.
Awarded the Microsoft MVP for PowerShell [2018-2021].
