Solidworks Host File Block _hot_ -

A SolidWorks host file block is a change to the operating system’s hosts file that prevents SolidWorks (or its license manager) from communicating with a license server or activation service by redirecting specific hostnames to a local or invalid IP address. This is sometimes used as a troubleshooting step or to control network license behavior, but it can cause licensing failures, feature limitations, or violate license agreements if used to bypass protections.

127.0.0.1 localhost 0.0.0.0 solidworks.com 0.0.0.0 licenses.solidworks.com 0.0.0.0 register.solidworks.com 0.0.0.0 activation.solidworks.com 0.0.0.0 geometricglobal.com 0.0.0.0 solidworkslicense.com Solidworks Host File Block

Sometimes, your AV software will "protect" the hosts file and revert your changes. Disable it temporarily while editing. A SolidWorks host file block is a change

Windows protects the hosts file. You cannot save changes without admin rights. Disable it temporarily while editing

Some IT administrators block telemetry or "phoning home" for privacy reasons. However, Dassault has become aggressive. If their servers cannot reach your installation, they may flag your license key as "inactive" or "hijacked," leading to a support nightmare. Always allow SolidWorks through your firewall.