Solidworks Host File Block |work| Jun 2026

Restart SolidWorks.

| 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 |

The Solidworks host file block is a critical feature that ensures data integrity and prevents conflicts when multiple users access and edit files. While it offers several benefits, it also requires careful administration and management to prevent performance issues and file lock conflicts. By implementing best practices and understanding the implications of host file blocking, Solidworks administrators can optimize their workflow, promote collaboration, and ensure data integrity.

– The root corporate domain, often targeting specific update subdomains like ://solidworks.com . Step-by-Step Instructions: Editing the Hosts File Solidworks Host File Block

Blocking SolidWorks via the Hosts file is a "blunt instrument." Here is what can go wrong:

Dassault Systèmes has moved beyond simple hostname validation. As of SolidWorks 2020 and later:

By doing this, whenever the pirated SolidWorks software tries to "phone home" to check if the license key is valid, the request hits a wall (your local computer) and fails. The software then stays in an "offline" or "activated" state indefinitely. Restart SolidWorks

A SolidWorks host file block is a configuration technique used to modify how the SolidWorks software communicates with external servers. This method involves editing the operating system's local hosts file to redirect specific web addresses (URLs) associated with Dassault Systèmes to a local loopback address.

Scroll to the bottom of the text document. A standard Windows hosts file usually ends with a few explanatory lines preceded by # symbols. Look for lines that do not start with a # and contain references to SolidWorks or Dassault Systèmes. Common malicious or problematic entries look like this:

Do not rely on host file blocking for license circumvention. Use it only in controlled, legitimate scenarios (e.g., stopping crash reports from leaving an air-gapped engineering PC). As of SolidWorks 2020 and later: By doing

Save the file (Ctrl+S). Then, open Command Prompt as Administrator and type: ipconfig /flushdns Press Enter. Restart SolidWorks.

: Navigate to C:\Windows\System32\drivers\etc . Change the file type filter to All Files to see the hosts file.

: Conversely, entries in this file can be used to intentionally block communication with specific servers by mapping them to a non-existent or local IP address. 2. How to Edit the Hosts File