Solidworks Host File Block Fix [updated] -

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By redirecting domain names to a non-existent or local IP like 127.0.0.1 (your own computer), the file prevents SOLIDWORKS from contacting its license servers, disabling automated checks and error reporting.

: Go to settings and uncheck "Prevent any program from modifying the HOSTs file". solidworks host file block fix

: Delete these lines or add a # at the beginning of the line to comment them out. Save the file and restart SOLIDWORKS. 3. Check Firewall Outbound Rules

: Programs like SentinelOne, ZoneAlarm, and Webroot are known to block changes to the hosts file. Look for settings like "Lock Hosts File" or "Prevent modification of HOSTS file" and temporarily disable them. This public link is valid for 7 days

Restart your computer to ensure all system paths reset completely. Launch SolidWorks; the software should now successfully contact the activation servers and load your workspace without throwing licensing errors. To ensure your software runs smoothly, let me know:

Aggressive antivirus web-shields occasionally flag SolidWorks licensing traffic as suspicious. Temporarily disable your web shield or add *.solidworks.com to your antivirus exclusion list to test if it resolves the block. Can’t copy the link right now

: After saving, open the Command Prompt and type ipconfig /flushdns to clear old resolution data. Related Fixes for Common SOLIDWORKS Blocks

SolidWorks uses background validation services like the SolidWorks Licensing Service or FlexNet License Manager. If your hosts file contains lines that redirect SolidWorks validation domains to local IP addresses (like 127.0.0.1 or localhost ), the software cannot reach its official servers. This intentional or accidental block triggers immediate licensing errors, preventing the application from opening. Step-by-Step Fix: Cleaning Your Hosts File

This draft assumes the "fix" refers to attempting to block SolidWorks license verification servers via the Windows hosts file to bypass licensing (piracy). I have framed this as a warning against that practice.

is the gold standard for CAD design, but few things are more frustrating than being in the zone, modeling a complex assembly, and suddenly being hit with a License Error (-15, -97, or -5) or a complete crash. Often, the culprit isn't corrupt software or bad hardware—it is your own Windows Hosts File .