Block — Solidworks Host File
The Ultimate Guide to the SolidWorks Host File Block: Why, How, and the Risks
Introduction
If you have ever installed SolidWorks—whether for legitimate educational purposes, testing, or unfortunately, through unauthorized means—you have likely stumbled upon a cryptic instruction buried in a readme.txt file or a YouTube tutorial: "Block SolidWorks exe's in firewall" or "Add these lines to your hosts file."
| Domain | Purpose |
|--------|---------|
| localhost | Standard loopback – do not block |
| sw.activation.dart | Activation server |
| license.dat | License validation |
| solidworks.com | Main update & telemetry |
| solidworks.global.ssl.fastly.net | CDN for updates |
| dsls.dassault-systemes.com | License server |
| events.spatial.com | Telemetry | Solidworks Host File Block
Step 4: Save the file (no extension).
Navigate to the File: Go to File > Open and paste this path: C:\Windows\System32\drivers\etc\. Change the file type dropdown from "Text Documents (.txt)" to **"All Files (.*)"** to see the hosts file. Add Your Entry: To Block: Add a line like 0.0.0.0 license.solidworks.com. The Ultimate Guide to the SolidWorks Host File
127.0.0.1 localhost
127.0.0.1 www.solidworks.com
127.0.0.1 solidworks.com
127.0.0.1 register.solidworks.com
127.0.0.1 activation.solidworks.com
127.0.0.1 license.solidworks.com
127.0.0.1 solidworks.licensing.com
127.0.0.1 dsxclient.dataservices.solidworks.com
127.0.0.1 events.solidworks.com
127.0.0.1 swym.3dexperience.solidworks.com
127.0.0.1 www.solidworks.com
127.0.0.1 solidworks.com
127.0.0.1 activation.solidworks.com
127.0.0.1 licensing.solidworks.com
127.0.0.1 swdm.solidworks.com
127.0.0.1 www.swdm.solidworks.com
127.0.0.1 solidworksnetworklicensemanager.solidworks.com
127.0.0.1 www.solidworksnetworklicensemanager.solidworks.com
Check Your Ports: If the Hosts file doesn't fix it, ensure your firewall isn't blocking the specific ports SOLIDWORKS needs, such as 3030 (Archive), 1433 (SQL), or 25734/25735 (Licensing). Check Your Ports : If the Hosts file
Part 8: How to Remove the SolidWorks Host File Block
If you have a legitimate license or want to clean your system: