Solidworks Host File Block Fix Jun 2026

The hosts file is located deep within the Windows system directory. Open File Explorer. Navigate to: C:\Windows\System32\Drivers\etc . 2. Open the File as Administrator

For many engineers and IT administrators, this is the moment they first hear about the . This isn't a virus or a hardware failure. It is a sophisticated, intentional act of "digital leash pulling" by the software itself.

If you're experiencing any of the following symptoms, it's possible that your host file is blocked:

If you recently transferred your license, try deactivating and reactivating .

Save the file. To ensure Windows uses the new entry immediately, open a Command Prompt and type ipconfig /flushdns , then press Enter. Additional Troubleshooting for Persistent Blocks solidworks host file block fix

If the Hosts file is clear but you still face blocks, your firewall may be preventing the connection.

Use the Help > Licenses > Activate... feature to refresh your license status. If you'd like, I can: Help you find the exact IP address of your license server. Provide steps to reinstall the FlexNet licensing service .

Push a GPO that:

Navigate to the following path: C:\Windows\System32\drivers\etc Locate the file named . Step 2: Editing the Hosts File to Remove Blocks The hosts file is located deep within the

There it was. At the very bottom of the text file, a series of lines had been added. They were redirecting the SolidWorks licensing URLs to 127.0.0.1 —the digital equivalent of a dead-end street.

Type the following command and press Enter: ipconfig /flushdns

Scenario B: Pointing to a Local License Server (SolidNetWork License)

If you are working in a managed environment and these entries keep coming back, speak with your IT department, as security policies might be automatically modifying the hosts file. If you'd like, I can help you with specific steps for: It is a sophisticated, intentional act of "digital

Navigate to the following directory path: C:\Windows\System32\drivers\etc

Save the file, restart your machine, and launch SolidWorks to verify that your connection block is cleared.

: Check your antivirus settings to ensure "Prevent any program from modifying the HOSTs file" is unchecked.

With a steady hand, he highlighted the offending lines and hit Delete . He felt like an archaeologist brushing dust off a hidden inscription.