Author name: Antonio Rennvick

Antonio Rennvick is an IT Infrastructure Manager with 15+ years running enterprise Active Directory, Microsoft 365, and Azure environments. He's Microsoft certified (AZ-104, MS-102) and writes Core365 Cloud to share what actually works in production—PowerShell automation, AD deep dives, and security hardening drawn from real-world work, not test labs.

ADFS Troubleshooting Windows Server

ADFS WAP error – Unable to retrieve proxy configuration data from the Federation Service.

 This error typically occurs when the Web Application Proxy (WAP) is unable to authenticate with the ADFS server. Here are some common causes and troubleshooting steps: Possible Causes: Service Account Password Expiry or Mismatch The WAP server authenticates with ADFS using a trust relationship that relies on a certificate and/or service account. If the password […]

Active Directory Troubleshooting Windows Server

The “trust relationship between this workstation and the primary domain failed”

  The “trust relationship between this workstation and the primary domain failed” error typically means that the secure channel between the client (your Windows Server 2008 R2 machine) and the domain controller (DC) is broken. This can happen if the computer’s account password in Active Directory (AD) has become unsynchronized with the password stored on

ADFS Windows Server

Renew ADFS Certificate

Renewing an Active Directory Federation Services (ADFS) certificate involves multiple steps, depending on which certificate you are renewing. The impact on users depends on the type of certificate being updated. Types of ADFS Certificates Service Communications Certificate – Used for encrypting SSL/TLS traffic (external users may be impacted if not updated properly). Token-Signing Certificate –

Windows 11 Tips

How to Reset a Forgotten Password on Windows 11

 Forgetting your Windows 11 password can be a frustrating experience, but don’t worry, there are several ways to regain access to your system. In this guide, we’ll walk you through the various methods you can use to reset your forgotten password and get back into your computer. Method 1: Reset Password Using a Microsoft Account

NTP Server Windows Server

How to sync your Active Directory (AD) time with a reliable time source

1. Choose a Reliable Time Source You can use NTP (Network Time Protocol) servers from a reliable provider such as: Microsoft NTP servers: time.windows.com NIST (U.S. Government): time.nist.gov Singapore NTP servers: sg.pool.ntp.org  2. Configure the PDC Emulator to Sync with an External NTP Server The PDC Emulator (Primary Domain Controller Emulator) is responsible for time

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