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Resolving SolidWorks Installation Failures Caused by Hosts File Blocks

If a computer previously hosted an unauthorized or pirated version of SolidWorks (or other CAD software), automated crack scripts frequently modify the hosts file to block activation checks. When you attempt to transition to a legitimate, licensed version, these old blocks remain and prevent the official Installation Manager from verifying the serial number.

The Windows hosts file is a local text file that maps hostnames to IP addresses. Operating systems check this file before querying external Domain Name System (DNS) servers. If a SolidWorks activation or licensing domain is mapped to a loopback address (like 127.0.0.1 or ::1 ), the operating system redirects the traffic back to your own machine, completely blocking external communication. Why Do SolidWorks Domains Get Blocked? solidworks host file block install

If you configure this file to point a specific SOLIDWORKS web domain to a dummy or local IP address, the computer will attempt to route the traffic there instead of connecting over the live internet. This method is highly useful for:

To test if the SolidWorks installation is blocked, try to download and install SolidWorks. The installation process should fail or be redirected. Operating systems check this file before querying external

If you want to allow the installation of SolidWorks, simply remove the entries you added to the hosts file.

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. If you configure this file to point a

127.0.0.1 ://solidworks.com 127.0.0.1 ://solidworks.com 127.0.0.1 sw://solidworks.com Use code with caution.