To resolve issues where SOLIDWORKS (particularly PDM) cannot connect to a server or where an installation is blocked by the Windows file, follow this guide to modify or unblock the file. 1. Fixing DNS/Connectivity via the Hosts File

But why does this happen, and how do you fix it permanently without reinstalling Windows?

If you are a SolidWorks user, particularly in a corporate or network licensing environment, you may have encountered the dreaded license activation error. Often, this error isn't caused by a wrong serial number, but by a misconfigured Windows that blocks communication with Dassault Systèmes' activation servers.

SOLIDWORKS is a powerful computer-aided design (CAD) software used by engineers and designers worldwide to create, simulate, and manufacture innovative products. However, some users may encounter connectivity issues while using SOLIDWORKS, particularly when trying to activate the software or access online features. One common error message that may appear is "The activation of SOLIDWORKS requires a connection to the internet" or "SOLIDWORKS could not connect to the internet." In many cases, the issue is related to the host file block, which prevents SOLIDWORKS from communicating with the necessary servers.

PDM connectivity tests fail when trying to reach the Archive or Database server. Open Notepad as Administrator Click the Start menu and type Notepad . Right-click Notepad and select Run as Administrator . Navigate to the Hosts File In Notepad, go to File > Open .

In Notepad, go to File > Open . Navigate to the following directory: C:\Windows\System32\drivers\etc\ Note: Change the file type filter in the bottom-right corner from "Text Documents ( .txt)" to All Files ( . ) to see the hosts file.*

Restart your computer to ensure the changes take effect. Additional Troubleshooting Steps for SolidWorks Licensing