Solidworks Host File Block Fix

A blocked Hosts file is a frustrating but easily fixable barrier to getting SolidWorks up and running. By removing unauthorized redirection lines, flushing your network cache, and ensuring your local firewall permissions are clear, your workstation will successfully communicate with Dassault Systèmes' activation servers, ensuring zero downtime for your engineering projects.

Restart your computer to ensure the changes take effect. Additional Troubleshooting Steps for SolidWorks Licensing solidworks host file block fix

How to Fix SolidWorks Activation Issues Caused by Host File Blocks A blocked Hosts file is a frustrating but

Open File Explorer and navigate to:

The Windows hosts file is a plain text file used to map hostnames to IP addresses. It’s a low-level, local DNS system. Sometimes, security software, network administrators, or previous installations can inject entries into this file that instruct your computer to redirect or block connections to specific web addresses. If SolidWorks fails to activate with a message

If SolidWorks fails to activate with a message about firewall issues, server unavailability, or "invalid license," it is likely a blocked connection.

After unblocking and editing the hosts file, verify the connection using the PDM Connectivity Test Tool or by attempting to ping the server by name in the Command Prompt. If the connection still fails, check if the or SolidWorks Licensing Service are running and set to Automatic in Windows Services.