Solidworks Host File Block Fix Jun 2026

Scroll down to the bottom of the document. Standard Windows entries usually stop after lines explaining localhost mappings with # symbols.

Search for in the Start Menu, right-click it, and select Run as Administrator before opening the file. How to Configure the Local Hosts File Follow these steps to manually map your SOLIDWORKS server:

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

: Use the built-in SOLIDWORKS Repair Tool when prompted by a corruption dialog box. solidworks host file block fix

Go to Control Panel > Internet Options > Connections > LAN Settings and ensure "Automatically detect settings" is checked. Conclusion

Desperate, he pulled up his laptop and began a frantic deep-dive into the darker corners of tech forums. He bypassed the official support pages—they were filled with "reinstall the program" advice that he didn't have time for. Finally, on page four of an obscure sysadmin board, he found a thread titled: “The Invisible Wall: When Your System Blocks the Handshake.” The culprit? The

Verify that inbound and outbound ports 25734 and 25735 are open for the SolidNetWork License Manager. Scroll down to the bottom of the document

The activation wizard fails immediately without attempting a prolonged network search.

# SolidWorks Block 127.0.0.1 www.solidworks.com 127.0.0.1 solidworks.com 127.0.0.1 www.swdoc.com 127.0.0.1 swdoc.com 127.0.0.1 customerportal.solidworks.com 127.0.0.1 activation.solidworks.com 127.0.0.1 licensing.solidworks.com 127.0.0.1 ls.solidworks.com 127.0.0.1 www.solidworks.com.swtea.com 127.0.0.1 swtea.com

💡 Add a comment line above to remind yourself why you did this: # SolidWorks block list - added March 2026 How to Configure the Local Hosts File Follow

To fix a SOLIDWORKS "host file block" error, you typically need to map your license server's IP address to its hostname within the Windows file or ensure your antivirus isn't preventing SOLIDWORKS from reading it . Quick Fix: Modifying the Windows Hosts File

To fix connection issues, you may need to ensure your hosts file is not blocking the necessary SolidWorks communication, or alternatively, properly map your local server IP. 1. Navigate to the Hosts File

Choose and enter 25734, 25735 into the Specific local ports box.

What do you see when the software fails?