Jeff Chandler

Jeff Chandler is a trusted voice in cybersecurity, often invited to share his insights on podcasts, local news, and industry publications. As the Founder and CEO of Z-JAK Technologies, he leads a Louisville-based Managed IT Services Provider that helps small and mid-sized businesses stay secure, compliant, and future-ready in an increasingly risky digital world. At Z-JAK, Jeff and his team deliver cybersecurity-first, white-glove IT support to industries such as manufacturing, professional services, and law firms throughout the Louisville metro region. His philosophy is simple: protect businesses today while preparing them to thrive tomorrow. With over 40 years of experience as a developer, systems architect, business consultant, and insurance executive, Jeff brings a rare blend of technical expertise and business leadership. He previously served as Chief Technology Officer for Jefferson National Financial, where he was part of the startup team that built the company from the ground up and played key roles in its growth and success. Today, Jeff combines his deep technical knowledge with his passion for helping businesses succeed, guiding leaders to adopt technology and AI strategies securely, effectively, and with confidence.

Is Your Guest Wi-Fi Really Separate? How to Find Out

white wifi router

TL;DR: Guest Wi-Fi should give visitors internet access and nothing else. A second network name doesn’t prove that’s happening. Real separation is enforced by your firewall, and 2026 research showed the common “client isolation” setting can be bypassed on its own. Test your guest network from a phone, put visitors and personal devices on it,

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How to Take Back Admin Rights Before Ransomware Uses Them

people working on computer

TL;DR: Most small businesses never chose to make employees administrators on their computers. A Microsoft 365 default did it for them. Administrator access lets one bad click install software, change security settings, and switch off protection. Give staff standard accounts for daily work, keep admin rights in a separate managed account, and change the default

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