Windows Server 2025 as DC: Avoid in mixed environments (RC4 issue)

Posted on 2025-09-27 by guenni

Windows[German]Today, another post for domain controller administrators. If anyone is thinking about adding a Windows Server 2025 as a domain controller (DC) in a mixed environment, don't do it. Adding the new Windows Server 2025 DC to an existing structure with old Windows Server DCs causes massive problems. The machine password cannot be changed and domain logins fail sporadically. This is a bug in Windows Server 2025 that has not been publicly confirmed, but the Microsoft product group is working on fixing it.

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Windows Server 2019: OneDrive issue related to FSLogix

Posted on 2025-09-26 by guenni

Windows[German]There has been a nasty bug in OneDrive in conjunction with FSLogix since weeks, that occurs on Windows Server 2019, according to a reader observation. OneDrive items can then no longer be renamed. Microsoft Support has already thrown in the towel in this context. Here is a summary of what we know so far.

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Windows 10 22H2: Preview Update KB5066198 (September 25, 2025)

Posted on 2025-09-26 by guenni

Windows[German]Two days late, Microsoft has released the preview update KB5066198 for Windows 10 22H2. Among other things, this fixes the SMBv1 bug, which was already eliminated for Windows 11 23H2 on September 23, 2025, via a preview update. I have added the information to the article Windows 10 22H2/Windows 11 23H2: Preview Updates (September 23/25, 2025).

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Cisco Adaptive Security Appliance attacked via zero-day vulnerability

Posted on 2025-09-26 by guenni

Sicherheit (Pexels, allgemeine Nutzung)[German]The US Cybersecurity and Infrastructure Security Agency (CISA) has issued an urgent warning to US authorities. Cisco ASA (Adaptive Security Appliance) is under active attack via zero-day vulnerabilities in its web services. US authorities must respond immediately to the vulnerabilities and take countermeasures.

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Windows Server 2016: Doesn't get updates since August 2025

Posted on 2025-09-26 by guenni

Windows[German]I'm posting a problem here on the blog that an administrator brought to my attention last week. He is still running Windows Server 2016 Essentials and is facing the problem that Windows updates are no longer being offered for it. The question is whether other administrators among our readers have observed something similar?
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Why ISL Online: Critical factors when choosing a remote desktop solution

[Sponsored Post]In the rapidly evolving IT world, choosing the right remote desktop software is critical for organizations that value security, ease of use and reliability. One provider of secure remote access that has been on the market since 2001 is ISL Online, which presents some considerations for choosing such software below. More ...

Windows 10: Microsoft offers ESU in the EEA without conditions for consumers

Posted on 2025-09-25 by guenni

Windows[German]This is an exciting development. Microsoft has promised a consumer protection organization that private users in the European Economic Area (EEA) will receive the Extended Security Update (ESU) program without any requirements such as a backup app, Microsoft account, etc. and for free. In other regions ESU will come with several requirements.

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Follow-up on security incident at Collins Aerospace that interrupts airports

Posted on 2025-09-25 by guenni

Sicherheit (Pexels, allgemeine Nutzung)[German]On the evening of September 19, 2025 (Friday), there was a ransomware attack on the service provider Collins Aerospace, which operates, among other things, check-in systems for airports. As a result, numerous flights were canceled over the weekend (in Europe – and in other parts of the world), and the IT disruptions at the service provider continue to this day. Here is a brief review of what went wrong and what is still wrong. And there has been an arrest in connection with this incident. And there is a clue as to the type of ransomware used.

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Windows 11 23H2: SMBv1 bug fixed by update KB5065790

Posted on 2025-09-24 by guenni

Windows[German]After installing the security updates for Windows 10 and Windows 11 (and also some Server versions) released on September 9, 2025, a problem with accessing SMBv1 network shares occurs for users. As of September 23, 2025, Microsoft has fixed this bug, at least with the preview update KB5065790 for Windows 11 23H2.

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Windows 10 22H2/Windows 11 23H2-25H2: Preview Updates (September 23/25/29, 2025)

Posted on 2025-09-24 by guenni

Windows[German]Microsoft released the optional cumulative (preview) update KB5065790 for Windows 11 23H2 on September 23, 2025. For Windows 10 22H2, the preview update KB5066198 was not released until September 25, 2025. The preview update KB5065789 for Windows 11 24H2/25H2 was released on September 29, 2025. These preview updates contain fixes that can be tested and then rolled out generally as fixes in the following month. This will eliminate the SMBv1 bug.

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US secret service dismantles SIM server network threatening New York's mobile networks

Posted on 2025-09-24 by guenni

Sicherheit (Pexels, allgemeine Nutzung)[German]The US Secret Service has dismantled a secret network consisting of over 300 SIM servers with hundreds of SIM cards scattered across New York. These SIM servers could have overloaded the mobile phone stations in New York, where the United Nations is located, in the event of an attack.

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