Install — Solidworks Host File Block

The "SOLIDWORKS host file block install" issue typically occurs when the Windows hosts file prevents the SOLIDWORKS Installation Manager from communicating with activation or download servers. This block can manifest as a blank installation screen, connection errors, or activation failures. Understanding the Role of the Hosts File

What it is

• The hosts file is a local OS file that maps hostnames to IP addresses before DNS is consulted. By mapping a SolidWorks activation or license-server hostname to 127.0.0.1 (or another unreachable IP), the system cannot reach that server and activation/license validation requests fail.
• Typical targets include SolidWorks activation/serial-check domains or named license server hostnames.

Note: You must change the file type filter in the bottom-right of the Open dialog from "Text Documents ( "All Files ( to see the hosts file.* Add Server Info solidworks host file block install

To "block" a hostname, you map it to 0.0.0.0 or 127.0.0.1 (the local loopback address), which prevents the computer from reaching the actual server. The "SOLIDWORKS host file block install" issue typically

Save & Flush: Save the file. Then, open Command Prompt and type ipconfig /flushdns to clear your cache. The hosts file is a local OS file