A VPN handshake that keeps failing may not be a software problem—it could be a...

https://www.random-bookmarks.win/cybersecurity-starts-with-the-network-you-can-touch-a-mispatched-cable-can

A VPN handshake that keeps failing may not be a software problem—it could be a damaged patch lead. This article shows how cabling, switches and basic setup mistakes can create real security risks.