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- guenni on Windows Server 2025: Domain Controller no longer accessible after restart
- Glenn on Outlook 365: Microsoft confirms CPU spikes while typing
- Frank Rizzo on Is VMware ESXi 8 back for free?
- Anonymous on Windows Server 2025: Domain Controller no longer accessible after restart
- Stephane MONIER on Microsoft Word 365/2021 crashes (April 7, 2025)
Recent Comments
- guenni on Windows Server 2025: Domain Controller no longer accessible after restart
- Glenn on Outlook 365: Microsoft confirms CPU spikes while typing
- Frank Rizzo on Is VMware ESXi 8 back for free?
- Anonymous on Windows Server 2025: Domain Controller no longer accessible after restart
- Stephane MONIER on Microsoft Word 365/2021 crashes (April 7, 2025)
Category Archives: Security
TLS server certificates only valid for 47 days from 2029
[Ger]Brief information for administrators. Browser manufacturers and Certificate Authorities (CAs) have decided to shorten the lifespan of TLS server certificates from 13 months to 47 days. However, there is a transition period for this change until 2029, during which the … Continue reading
Windows: Mysterious folder C:\Virus; Trend Micro involved?
[German]I am posting a very unusual observation by an administrator among the blog readers here on the blog. He noticed that an ominous folder c:\virus was "suddenly" created on his clients on the system drive. The cause has not yet … Continue reading
Microsoft Entra ID: Service principal-less authentication will be discontinued (March 2026)
[German]At the end of March 2025, Microsoft announced that Microsoft Entra ID will no longer support service principal-less authentication from March 2026. Microsoft Entra ID will then block authentication for multi-tenant applications that do not have an enterprise application registration … Continue reading
Android smartphones found with pre-installed Triada malware; stalkerware wants password to uninstall
[German]A small addendum on the subject of Android security. Some time ago, cheap Android smartphones were once again found with the Triada malware pre-installed. The Remote Access Trojan (RAT) extracts personal data. The campaign mainly affected Russian victims, as Kasperski … Continue reading
Outlook: New requirements for bulk emails
[German]In future, Microsoft will specify new requirements for sending bulk emails in Outlook. For domains that send more than 5,000 emails per day, Outlook will soon require compliance with SPF, DKIM and DMARC. Non-compliant messages will initially be sent to … Continue reading
Windows PCs at risk from WhatsApp flaw (CVE-2025-30401)
[German]A vulnerability in WhatsApp for Windows (before version 2.2450.6) puts Windows computers at risk. The vulnerability could allow attackers to execute malicious code via WhatsApp message attachments on Windows.
Windows: Kerberos PAC Validation Protocol in enforcement mode since April 8, 2025
[German]Quick reminder for administrators, in case anyone hasn't noticed. On the April 2025 patchday (8.4.2025), the "enforcement phase" for the hardening of the Kerberos protocol regarding the Kerberos PAC Validation Protocol came into force. This removed certain modes that could … Continue reading
Windows vulnerability CVE-2025-29824 attacked; install April 2025 updates
[German]There is a use-after-free vulnerability CVE-2025-29824 in Windows, which has probably already been exploited by ransomware groups. Microsoft has released security updates for April 2025 that also close this vulnerability. Users and administrators should therefore install the April 2025 updates … Continue reading
Windows 10/11: All updates for Windows from the April 2025 patchday available
[German]Not all Windows security updates were ready for the patch day in April 2025 (April 8, 2025). For example, the update for Windows 10 (RTM version, version 1507) was completely missing. Microsoft has now delivered this update and also published … Continue reading
Posted in Security, Update, Windows
Tagged Patchday 4.2025, Security, Update, Windows 10
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Patchday: Microsoft Office Updates (April 8, 2025)
[German]On April 8, 2020 (second Tuesday of the month, Microsoft Patchday), Microsoft released several security-related updates for Microsoft Office 2016, as well as the C2R variants (Office 2016-2021 and 365) and other products. Below you will find an overview of … Continue reading
Posted in Office, Security, Software, Update
Tagged Office, Patchday 4.2025, Security, Update
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