If Windows machines fail to complete EAP-TLS authentication with ISE, with Event 5400 Authentication failed error, follow the solutions mentioned below. Note: You might get a few messages saying ...

Microsoft says the April 2025 security updates are causing authentication issues on some Windows Server 2025 domain controllers. The list of impacted platforms includes Windows Server 2016, Windows ...

Update 5/20: Microsoft now considers these authentication problems to be resolved, having released “out-of-band” updates on May 19, as described here. Microsoft this week acknowledged possible ...

The Cybersecurity & Infrastructure Security Agency (CISA) is now advising federal agencies and others to patch a Windows flaw from Microsoft's May Patch Tuesday. CISA has re-added the Windows flaw CVE ...

Microsoft has hardened authentication for its DCOM Server in response to a vulnerability. Check for the impact on your network now before the change becomes permanent. Microsoft’s June security update ...

Microsoft this week indicated that it plans to eliminate the need to use the New Technology LAN Manager (NTLM) protocol in Windows 11, with Kerberos taking its place. NTLM use has long been a ...

This post will show you how to enable multifactor authentication in Microsoft 365. Multifactor Authentication (MFA) provides an extra level of security for sign-ins. In Microsoft 365, MFA includes a ...

The Kerberos authentication method originated at the Massachusetts Institute of Technology in the 1980s, as part of a project called Athena. The project involved integrating the computers on the MIT ...