You must open Notepad (or your editor of choice) as an Administrator, or you won't be able to save your changes. The Syntax: To block a specific address, you map it to . For example: 127.0.0.1 im-a-server-causing-lag.solidworks.com Save and Flush: Save the file, then open your Command Prompt and type ipconfig /flushdns to make the changes active immediately. When Should You Use This?
If a virus gains access to your hosts file, it can redirect bankofamerica.com to a fake phishing site. Once you have manually edited your hosts file to block SolidWorks, the file is no longer "signed" or protected by Windows. Malware loves to append extra lines to an already-modified hosts file because users never check it again.
When the Windows hosts file contains entries that redirect or block SolidWorks activation and verification servers, users encounter persistent licensing errors, failure to connect to the SolidWorks Installation Manager, or sudden software deactivations.
: Antivirus programs (like SentinelOne, ZoneAlarm, or Webroot) often "block" the ability to write to the hosts file to prevent malware from redirecting traffic. These blocks must be temporarily disabled to apply the SOLIDWORKS fix. How to Configure the SOLIDWORKS PDM Host File Solidworks Host File Block
If your changes fail to save, right-click the hosts file, select Properties , ensure the Read-only checkbox is unchecked, and try saving again.
Sometimes, due to a bug or a corporate firewall issue, SolidWorks fails to find a valid license server because it is trying to connect to the wrong IP address. Advanced IT administrators may use the HOSTS file to a redirect.
Instead of using the hosts file to manage traffic, use the Windows Defender Firewall. Create explicit "Inbound" and "Outbound" rules for the SolidWorks executable files or the specific ports used by your license manager (typically ports 25734 and 25735 ). You must open Notepad (or your editor of
In the context of SOLIDWORKS, editing the Hosts file is used for two distinct purposes:
This process, known colloquially as the , is one of the most discussed yet misunderstood technical rituals in the CAD community.
What or behavior occurs when SolidWorks tries to connect? Are you on a corporate network with a strict firewall? When Should You Use This
Dassault Systèmes offers a full-featured version for hobbyists and makers. It has a watermark. It cannot open commercial files. But for learning and personal projects, it is $9 a month—cheaper than a pizza.
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By following these best practices and solutions, you can minimize the occurrence of SolidWorks Host File Block issues and ensure smooth, efficient, and productive design work.