Scroll down to the bottom of the document. Standard Windows entries usually stop after lines explaining localhost mappings with # symbols.
Navigate to the following directory path: C:\Windows\System32\drivers\etc
: The file itself may be set to read-only. solidworks host file block fix
Type the following command exactly as shown and press Enter: ipconfig /flushdns Use code with caution.
2. Verify Your Corporate SolidNetWork License (SNL) Settings Scroll down to the bottom of the document
He moved his mouse back to the workstation. He double-clicked the red SolidWorks icon.
If you follow this guide exactly, you will resolve the yellow triangle, recover your license server connection, and get back to engineering. However, if the error persists after three attempts, the problem is likely not the Hosts file—it is your network firewall, your license server hardware ID mismatch, or a corrupt .lic file. Type the following command exactly as shown and
Find or FlexNet Licensing Service . Right-click it and select Restart .
One highly effective, system-level solution is modifying the Windows Hosts file. This guide explains how the Windows Hosts file interacts with SolidWorks, how to use it to resolve licensing blockages, and how to safely implement the fix. Understanding the Windows Hosts File
If you are using SolidWorks on a corporate network, ensure your Windows Defender Firewall has open inbound and outbound exceptions for ports 25734 and 25735 . These are the default communication ports used by the SolidWorks licensing service. If these ports remain closed, editing the Hosts file will not fully resolve your connectivity roadblocks.
