Solidworks Host File Block May 2026

The most common payload in engineering cracks today is ransomware. You block the host file thinking you are saving $5,000 on a license. A week later, all your personal files and client drawings are encrypted, and you must pay $10,000 in Bitcoin to get them back.

Legitimate users get security patches. If you block the host file, you block those patches. Vulnerabilities in older versions of SolidWorks have been used as entry points for corporate espionage.

At the bottom of the file, you will add lines that redirect SolidWorks servers back to your local machine (127.0.0.1). Solidworks Host File Block

Common addresses to block include:

# SolidWorks Block List
127.0.0.1 localhost
127.0.0.1 solidworks.com
127.0.0.1 www.solidworks.com
127.0.0.1 login.solidworks.com
127.0.0.1 activation.solidworks.com
127.0.0.1 license.std.3ds.com
127.0.0.1 std.3ds.com
127.0.0.1 events.3ds.com
127.0.0.1 swym.3ds.com

Note: Dassault Systèmes frequently changes their server architecture. A list valid today may be obsolete tomorrow. The most common payload in engineering cracks today

The hosts file (C:\Windows\System32\drivers\etc\hosts) maps hostnames to IP addresses.

In the context of SolidWorks, a Host File Block refers to a specific list of URL addresses added to your computer's hosts file. This file acts as a local directory that maps hostnames to IP addresses. and you must pay $10

By adding specific SolidWorks URLs to this file and redirecting them to 127.0.0.1 (localhost), you effectively block your computer from communicating with SolidWorks servers. This is typically done to prevent the software from "phoning home" to verify licenses or check for updates.