Dmytro Poliakov In enterprise environments, phishing campaigns can impact hundreds or thousands of mailboxes within minutes. Once malicious emails are delivered, administrators must respond quickly and remove them centrally. This article presents a production-ready PowerShell script designed for bulk phishing email removal across all user mailboxes in on-premises Exchange environments. The script is intended for: This solution … Read more
In a large corporate domain environment, several Windows 11 workstations suddenly stopped connecting to shared USB printers hosted on other domain-joined PCs. When attempting to connect to USB Printer: The issue appeared after Windows 11 updates. Before the update everything worked normally. Initial Checks (All Looked Fine) We verified: Everything was correct. Yet the printer … Read more
This article explains how to fix a broken Windows Time (NTP) service on Windows Server or Workstation systems when synchronization fails or the service refuses to start. A typical scenario:User reports that system time is drifting, either behind or ahead. Kerberos starts failing. Domain authentication behaves inconsistently. You check the status: This typically means the … Read more
Faced the following issue A user reported that emails were sent successfully, but Gmail recipients never received them. There were no visible errors in Outlook, however mail flow logs showed the following rejection: Cause The email was sent: Example: Gmail checks: Result: Gmail rejects the message as spoofed. Why this happens You cannot send as … Read more
Windows Updates were stuck on Downloading for an extended period, sometimes even for days, without ever progressing to the installation phase. In this situation, the wuauserv process is often hung internally, it keeps the service in a RUNNING state but does not progress the update workflow. Restarting the service forces Windows Update to reinitialize its … Read more
Modern 64-bit versions of Windows, including Windows 11, do not support 16-bit applications. If you try to run one, you’ll get a compatibility error. This happens because the NTVDM subsystem is not available in 64-bit Windows. Fortunately, there’s a lightweight solution: WineVDM (also known as OTVDM). What Is WineVDM (OTVDM)? WineVDM is an open-source compatibility … Read more
SSL certificates on legacy infrastructure like Exchange Server 2010 often become a problem at the worst possible moment — when users start seeing “Not Secure” warnings in Outlook Web App (OWA) or mail flow begins to fail due to an expired certificate. Replacing an SSL certificate in Exchange 2010 is not just a matter of … Read more
Error:“The connection cannot be established. The agent installed on the machine must be removed. After removing the agent, try again to establish a connection.” Why This Error Appears: This issue usually occurs when you try to connect to a computer where the Dameware Agent is already installed, often an outdated or corrupted version. Fortunately, the … Read more