Solidworks Host File Block Install

If you find that the Hosts file approach is not adequately blocking application-level telemetry or if you are dealing with a heavily restricted network environment where Hosts files are automatically overwritten by group policies, configuring your is a robust alternative.

Open the Windows and search for Windows Defender Firewall with Advanced Security . In the left-hand pane, click on Outbound Rules .

When an entry in the hosts file maps a SolidWorks server to a local loopback address like 127.0.0.1 or 0.0.0.0 , Windows stops communicating with the actual internet server. The operating system assumes the service resides on the local machine. This mechanism is commonly used to block telemetry, advertisements, or software updates, but it can inadvertently halt legitimate software installations and licensing verification. Why SolidWorks Needs Host Access

: Search for Notepad in your Start menu, right-click it, and select Run as Administrator . solidworks host file block install

Type the following command and press Enter to force Windows to drop its cached, blocked routes: ipconfig /flushdns Alternative Solutions: Firewall and Anti-Virus Rules

After saving the file, you must clear your computer's DNS cache so it recognizes the new rules immediately. Open the (type cmd in the Start menu).

| Pros | Cons | |------|------| | Free, no extra software | Easily bypassed by some app versions | | System-wide, affects all users | Requires admin rights to edit | | Works without a firewall service | Can cause installer timeouts | | Permanent until manually removed | No granular control (all-or-nothing) | If you find that the Hosts file approach

By mapping these domains to 127.0.0.1 in the Windows etc/hosts file, the installation manager immediately skipped the online check and allowed the install to proceed from local files.

A generic error message stating that the Installation Manager cannot connect to the server to verify your serial number.

: The installer requires elevated permissions to write to system files. Right-click your and select Run as Administrator Manual DNS Workaround When an entry in the hosts file maps

The hosts file is a plain text operating system file that acts as a local, manual override for the Domain Name System (DNS). Before your computer queries external DNS servers to find out where to go on the internet, it checks the hosts file first. This allows you to map a hostname (like im.solidworks.com ) to any IP address you choose.

"You shall not... attempt to circumvent the technical limitations of the Software."

SOLIDWORKS installation sometimes requires managing how the software communicates with license servers or activation servers, particularly in complex network environments, offline setups, or specific enterprise deployments. One powerful technique to control this communication is by editing the Windows to block specific domains.